Thứ Tư, 18 tháng 1, 2017

Cusco Subframe Brace + 06 STI Diffuser? part 1

Uncle Ben 01-11-2006 04:02 AM

Cusco Subframe Brace + 06 STI Diffuser?
Does anyone know if installing the Cusco rear subframe brace makes installing the 2006 STI rear diffuser a bolt-on affair? Is it a complete package with the diffuser? Just trying to get an idea of what it is Cusco is selling...

[img]http://www.gruppe-s.com/Subaru/subext/cus_rbar.jpg[/img]
[img]http://www.gruppe-s.com/Subaru/subext/cus_difuser.jpg[/img]
bemani 01-11-2006 04:03 AM

Yes it is bolt on, no, diffuser and bracket sold separately.
kts262 01-11-2006 12:58 PM

A few vendors are selling the complete kit that comes with the Cusco kit and the diffuser. CVR Motorsports had a group buy on them a while ago and several of the other vendors are selling a kit. Check the last few pages of [url]http://forums.nasioc.com/forums/showthread.php?t=836333[/url] for pics and info on the install. Seems to work pretty good. I have the kit sitting in my basement waiting for a warm day to install it. You might need to go buy a few bolts since it looks like the kit might be missing 2-4 bolts.
DubyaSTi 01-11-2006 02:53 PM

Purchase the complete kit from someone. If you purchase the bar and diffuser seperate, you won't have the key component for installation, the two brackets. When you buy the diffuser seperate it comes with a bracket, but that bracket won't work unless you own a 06 STI.
Pictures on mine installed...
[img]http://memimage.cardomain.net/member_images/2/web/2078000-2078999/2078621_90_full.jpg[/img]
[img]http://memimage.cardomain.net/member_images/2/web/2078000-2078999/2078621_91_full.jpg[/img]
subieworx 01-11-2006 04:24 PM

I can't believe anyone would pay so much money for that damn bar. Makes no sense. I installed the diffuser by drilling 3 holes in the trunk. Some don't want to do this and i understand it, but then why waste so much money on the cusco bar.

Installed mine for $67 including all hardware and the cost of the diffuser.
Uncle Ben 01-11-2006 05:36 PM

I guess the bar also serves as a chassis stiffener... and the fact that it's made by Cusco probably explains the cost. I think I'm going to go for a front swaybar for now and put this on my upcoming wish list :p
kts262 01-11-2006 05:41 PM

It is supposed to stiffen the chassis but who knows if it really matters.

You can also buy the 3 brackets that subaru welded unto the body for the diffuser on the 06 and weld them on or find some other way to connect them to the car. I know of at least one person local to me who is looking at doing that.
subieworx 01-11-2006 06:35 PM

There is someone who has already done that. He is supposed to be posting pics soon.
Jpapania 01-11-2006 10:01 PM

I am getting ready to install the bar and diffuser. I know...bring it on call me a wus... I would also refer to this thread for everything you could ever want to know about the 06 diffuser:

[url]http://forums.nasioc.com/forums/showthread.php?p=12278445#post12278445[/url]
DubyaSTi 01-11-2006 10:55 PM

[QUOTE=Jpapania]I am getting ready to install the bar and diffuser. I know...bring it on call me a wus... I would also refer to this thread for everything you could ever want to know about the 06 diffuser:

[url="http://forums.nasioc.com/forums/showthread.php?p=12278445#post12278445"]http://forums.nasioc.com/forums/showthread.php?p=12278445#post12278445[/url][/QUOTE]
I would highly recommend getting another pair of hands to assist with the install of the bar. It's rather difficult to do by your lonesome.
Jpapania 01-14-2006 03:40 PM

Reply Dubya you could not have been more right. Damn wiggling that bar into place alone was a bitch, but I did get it solo. Had to unhook the rear sway to do it. Once in everyhing bolted up and looks great :banana:

To answer the original question starting this thread, here is everything you will need:

rear frame bar
673 487 A
Cusco rear brace

diffuser stay
672 487 S
Cusco brackets for mounting diffuser

factory diffuser
91225-FE000
SUBARU factory parts

factory diffuser bolt
90100-0159
SUBARU factory parts, 1 vehicle needs 4 bolts

You will also need to grab two bolts and nuts to mount the bumper bracket. Hope this helps.
joehack98 01-14-2006 04:23 PM

Are you guys installing it with the suspension unloaded.
Uncle Scotty 01-14-2006 04:27 PM

[QUOTE=joehack98]Are you guys installing it with the suspension unloaded.[/QUOTE]


NO...don't...

ramps
DubyaSTi 01-15-2006 12:36 AM

[QUOTE=Jpapania]Reply Dubya you could not have been more right. Damn wiggling that bar into place alone was a bitch, but I did get it solo. Had to unhook the rear sway to do it. Once in everyhing bolted up and looks great :banana:

To answer the original question starting this thread, here is everything you will need:

rear frame bar
673 487 A
Cusco rear brace

diffuser stay
672 487 S
Cusco brackets for mounting diffuser

factory diffuser
91225-FE000
SUBARU factory parts

factory diffuser bolt
90100-0159
SUBARU factory parts, 1 vehicle needs 4 bolts

You will also need to grab two bolts and nuts to mount the bumper bracket. Hope this helps.[/QUOTE]
Did you have a difficult time with one of the bolts on the passenger side? I can't remember if it was the front or back one but I couldn't tighten it all the way, and now I have a clunking noise coming from that exact area when I go over a bump. If you got them both very tight, how did you do it? lol
Jpapania 01-15-2006 01:33 AM

You can do the install on ramps, no need to unload the suspension. I did have to fully unhook my rear sway bar to wrestle the cusco bar into face. May not have to do it if you don't have the fat ass COBB bar like me ;)

I got all my bolts tight, but I had to unbolt the charcoal canister to do so on the passanger side. Otherwise it is a bitch getting to the rear bolt on that side.
DubyaSTi 01-15-2006 01:37 AM

[QUOTE=Jpapania]You can do the install on ramps, no need to unload the suspension. I did have to fully unhook my rear sway bar to wrestle the cusco bar into face. May not have to do it if you don't have the fat ass COBB bar like me ;)

I got all my bolts tight, but I had to unbolt the charcoal canister to do so on the passanger side. Otherwise it is a bitch getting to the rear bolt on that side.[/QUOTE]
Damn, I had to unbolt the canister as well, but still no luck tightening that one bolt all the way. I guess I'll try again on a nice day or have the dealer look at it next time I'm in for service.
Bishop 01-15-2006 02:20 AM

[QUOTE=Jpapania]You can do the install on ramps, no need to unload the suspension. I did have to fully unhook my rear sway bar to wrestle the cusco bar into face. May not have to do it if you don't have the fat ass COBB bar like me ;)

I got all my bolts tight, but I had to unbolt the charcoal canister to do so on the passanger side. Otherwise it is a bitch getting to the rear bolt on that side.[/QUOTE]

waitin on pics mang!! so it's possible to use this brace w/the cobb rear sway and mounts?? lovely.
joehack98 01-15-2006 02:51 AM

Most bracing in my experiance should be done with the suspension UNloaded. For obvious reasons.
Uncle Scotty 01-15-2006 03:08 AM

[QUOTE=joehack98]Most bracing in my experiance should be done with the suspension UNloaded. For obvious reasons.[/QUOTE]


.... work associated with the swaybars should be done with the suspension LOADED
joehack98 01-15-2006 02:56 PM

A brace is not associated with a antisway bar.
Jpapania 01-15-2006 05:40 PM

Okay here are the install instructions:

[url]http://forums.nasioc.com/forums/showthread.php?p=12318619#post12318619[/url]
Riight112 02-17-2006 01:05 PM

I really like the way the rear of your car looks. I have the cusco bar and the diffuser installed already and was planning on getting the rear spats for my car as well. My question is are the rear spats functional from an aerodynamic's perspective? Or are they purely for looks? I would assume they are somewhat functional since they are produced by STi. Anyone have an answer? Thanks.

[QUOTE=DubyaSTi]Purchase the complete kit from someone. If you purchase the bar and diffuser seperate, you won't have the key component for installation, the two brackets. When you buy the diffuser seperate it comes with a bracket, but that bracket won't work unless you own a 06 STI.
Pictures on mine installed...
[img]http://memimage.cardomain.net/member_images/2/web/2078000-2078999/2078621_90_full.jpg[/img]
[img]http://memimage.cardomain.net/member_images/2/web/2078000-2078999/2078621_91_full.jpg[/img][/QUOTE]
MD04WRX 02-17-2006 03:50 PM

[QUOTE=kts262]You can also buy the 3 brackets that subaru welded unto the body for the diffuser on the 06 and weld them on or find some other way to connect them to the car. I know of at least one person local to me who is looking at doing that.[/QUOTE]

I installed the rear defuser on my 04 wrx. I bought all the oem brackets and bolts from the local Subaru dealer for $87.60 (diffuser, 3 front bracket, one rear bracket, and 7 bolts). The rear bracket required me to drill 2 holes in the pinch weld area. After I bolted in the rear bracket, I attached the diffuser and marked the floor where the 3 holes in the diffuser were. To avoid welding and removing the factory undercoat, I drilled three holes in each front bracket. I scuffed the brackets and painted them so they would not rust. I then drilled & riveted the three brackets to the floor. Everything bolted up fine. It took about 1 hour (but I had a full size lift which made things very easy). The only thing I still want to do is undercoat the front brackets to match the rest of the floor. FYI there is one advantage to this (other than the cost). If you have a angled exhaust, you can move the diffuser to the right ( a little off center) for some extra clearance if needed.
dcoty 02-17-2006 05:06 PM

^ I think Im going to do mine that way...but when i got mine from the dealer I just got 1 bracket that mounts right behind the rear bumper. I need a second bracket as well?
Dan:)
MD04WRX 02-17-2006 05:15 PM

[QUOTE=dcoty]^ I think Im going to do mine that way...but when i got mine from the dealer I just got 1 bracket that mounts right behind the rear bumper. I need a second bracket as well?
Dan:)[/QUOTE]

There are 4 brackets you need. 1 that mounts behind the rear bumper and 3 that mount to the floor. The floor brackets are about $5.00 USD each - part number is 52153fe120 and bolts are 901000159.
DubyaSTi 02-17-2006 06:03 PM

[QUOTE=Riight112]I really like the way the rear of your car looks. I have the cusco bar and the diffuser installed already and was planning on getting the rear spats for my car as well. My question is are the rear spats functional from an aerodynamic's perspective? Or are they purely for looks? I would assume they are somewhat functional since they are produced by STi. Anyone have an answer? Thanks.[/QUOTE]
I highly doubt the rear spats are functional. It's listed as the "aerodynamics package" from Japan but IMO that's just marketing. I felt absolutely no difference between having them on or off.
Uncle Scotty 02-17-2006 10:21 PM

[QUOTE=DubyaSTi]I highly doubt the rear spats are functional. It's listed as the "aerodynamics package" from Japan but IMO that's just marketing. I felt absolutely no difference between having them on or off.[/QUOTE]


...was yer car lowered and how fast did ya go on what track?????
Riight112 02-18-2006 04:00 AM

[QUOTE=Uncle Scotty]...was yer car lowered and how fast did ya go on what track?????[/QUOTE]

Uncle Scotty, I take it that you disagree? Is it that the rear spats do serve an aerodynamic function, but the car has to be traveling at a decent speed for it to make a difference? I do plan to go to the track again when I have the time/money and having any aerodynamic edge would be a help to me (even if it is not very noticable).
Uncle Scotty 02-18-2006 01:04 PM

[QUOTE=Riight112]Uncle Scotty, I take it that you disagree? Is it that the rear spats do serve an aerodynamic function, but the car has to be traveling at a decent speed for it to make a difference? I do plan to go to the track again when I have the time/money and having any aerodynamic edge would be a help to me (even if it is not very noticable).[/QUOTE]

....it's all in the venturi.....the air coming under the car gets 'funneled' out the back, causing 'suction' that helps keep the ass end on the tarmac....the spats are part of the funnel....the 'diffuser' smooths the air for less turbulence, more 'suction'.

Usually, the lower the car the better this effect is.....and it is just one small part of the aerodynamics of the car......that is why Prodrive(in the past, anyway) only sold their 'kit' as a package, to be installed as a whole......so it actually WORKS.

Most of the kiddie crap ya see on the rice kiddies cars is NOT---say again most emphatically---[B]NOT aerodynamic in any sort of way[/B]----other than drag inducing :rolleyes: and heavy :rolleyes: ....and UGLY :rolleyes: :rolleyes: :rolleyes:
Riight112 02-19-2006 06:06 AM

Uncle Scotty, thanks for the reply. I definitely am not a fan of not functional and heavy fiberglass kits we all see on the roads with the rice rockets. I am more interested in the aerodynamics of it all and seeing that the rear spats are pretty subtle it fits my tastes very much.
STi-MAN 02-19-2006 06:35 AM

i hear someone having trouble installing the cusco diffuser kit when installed on a car running on perrin's rear sway bar and heavy duty mounts.. i dont understand why this would be a problem, but can anyone confirm this?
windfactory 03-04-2006 10:04 AM

Here is the image for installation, we can see it is really close to the sway:

[IMG]http://www.intakeone.com/images/Cusco/diffuserlisting.jpg[/IMG]

[URL=http://www.intakeone.com/Subaru_intake/CuscoRearDiffuser.htm]www.intakeone.com[/URL] has them in-stock as full kit, $215 is not too bad included oem diffuser, cusco subframe and brackets... for me, thinking to install one :p
spooledwrx 03-04-2006 12:23 PM

[QUOTE=DubyaSTi]Purchase the complete kit from someone. If you purchase the bar and diffuser seperate, you won't have the key component for installation, the two brackets. When you buy the diffuser seperate it comes with a bracket, but that bracket won't work unless you own a 06 STI.
Pictures on mine installed...
[img]http://memimage.cardomain.net/member_images/2/web/2078000-2078999/2078621_90_full.jpg[/img]
[img]http://memimage.cardomain.net/member_images/2/web/2078000-2078999/2078621_91_full.jpg[/img][/QUOTE]
Fujitsubo exhaust?

If not, it still looks FINE.
DubyaSTi 03-04-2006 03:47 PM

[QUOTE=spooledwrx]Fujitsubo exhaust?

If not, it still looks FINE.[/QUOTE]
Nope, STI Performance muffler aka the US version of the Genome. The difference between the JDM version and the US version is that the US version doesn't have the 'STI Genome' logo on the tip.
DubyaSTi 03-04-2006 03:51 PM

[QUOTE=Uncle Scotty]...was yer car lowered and how fast did ya go on what track?????[/QUOTE]
Yes the car is lowered but haven't tested it out on a track. I was referring to my experience as a daily driver. On a track going 150 mph maybe you notice a difference, but as a daily driver you will notice nothing from the spats.
Jpapania 03-05-2006 07:40 AM

[QUOTE=STi-MAN]i hear someone having trouble installing the cusco diffuser kit when installed on a car running on perrin's rear sway bar and heavy duty mounts.. i dont understand why this would be a problem, but can anyone confirm this?[/QUOTE]

I am running the cusco bar with the cobb sways and they are some of the widest. The problem is probably in the mounts. It is hard to describe, but the cusco bar has a small support and if your sway bar mounts are not a "U" shape the bar will not work.
txl146 11-08-2008 12:47 AM

Sorry to bring up the two year old thread - however, I have one question. I just placed an order for the 06 STI rear diffuser without 3 floor brackets. Is it possible to install diffuser without 3 floor brackets with just rear bracket alone? of course, I plan to drill holes to secure the diffuser.
Big-E 11-08-2008 12:23 PM

You could.

Here's your problem. You have a 2002 thus the factory rear bracket will not work.

You could go to Renickmotorsports and buy just the rear Cusco bracket.

Then you would of course just need two factory style shoulder bolts to mount the rear two openings of the diffuser to the bracket. The middle hole of the diffuser does not need to be used. The two forward holes you would need to use to mount it to the floor pan.

You have two options with respect to drilling and bolts. One is to simply mark the holes, drill, and then mount the diffuser, but it will be up higher since you are not utilizing either the Cusco bar or the factory floor pan brackets.

The other option is to mark the holes and drill. But what you do is intall bolts that are slightly longer from inside the car. Use bolts that are threaded all the way to the head. Put a locking nut up first, with washers on both sides, and lock the bolt in place. Then take two nuts and run them up the bolt. Decide where you want the diffuser to sit. Set the position of the nuts and double-lock them together. Put the diffuser up, use a washer and a nyloc self-locking nut. There, you now have the diffuser sitting at the correct height and angle.

So it would be bolt, washer, car, washer, nyloc nut, exposed bolt, two nuts locked against each other, a washer, diffuser, a washer, a nyloc nut. Just snug the nut and don't torque or overtighten.

Hope this helps.
txl146 11-10-2008 08:27 PM

Thanks for the reply... I ended up ordering 3 floor pan brackets.
subaru3169 03-08-2010 12:34 PM

apologies for bumping this oldass thread but it's much appreciated if someone can confirm coz i don't wanna start a new thread..





[quote=Jpapania;12924911]I am running the cusco bar with the cobb sways and they are some of the widest. The problem is probably in the mounts. It is hard to describe, but the cusco bar has a small support and if your sway bar mounts are not a "U" shape the bar will not work.[/quote]


^^^is this correct?? i have the whiteline hd sway mounts and those are not u shaped, they're rectangle shaped.. does this mean that i am not able to use the cusco bar??

tia

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