Cat-Back Query - Subaru WRX Forum
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post #1 of 20 Old 10-25-2006, 10:35 AM Thread Starter
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Cat-Back Query

I was wondering, i have not ever heard for sure whether or not they can help with any HP gains, I am going to put one on, I was just wondering if it actually can help performance, I assume if it does, it will only be marginal at best. I am not going for a TBE because it would void my warranty, which I paid extra to extend out 100k miles, so, I would like to keep it that way.
MMC

Matthew
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post #2 of 20 Old 10-25-2006, 10:39 AM
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I dont think you will gain HP from just doing catback, becuase the rest of the exhuast system is still very constricted.
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post #3 of 20 Old 10-25-2006, 03:30 PM
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Quote:
Originally Posted by metroscub
I am not going for a TBE because it would void my warranty, which I paid extra to extend out 100k miles, so, I would like to keep it that way.
MMC
damn, TBE voided your warranty huh...well hope it doesnt void mine

'06 WRX---Black Pearl
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post #4 of 20 Old 10-25-2006, 04:39 PM Thread Starter
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the dealership said to keep from voiding the warranty, you cannot remap the ecu, move sensors....exhaust(o2), cannot change control to boost, .

SO bascially, you can:
put stickers on it(+3,009.2345 hp)
cat back
tint(+2.7hp)
BOV
intake
gauges


I need to save some money anyhow, and 36k miles is not too bad, though I know that I am going to void that way sooner than 3 years or 36k miles.....

Matthew
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post #5 of 20 Old 10-25-2006, 04:52 PM
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BOV voids it, and gauges void your electrical warranty.

Unless you get the gauges from Subaru, and have a Subaru tech install em.

Brent
2007 Satin White STi, 1989 Nissan Sil-Coupe, 1998 Toyota 4runner (to be built..)...
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post #6 of 20 Old 10-25-2006, 07:35 PM
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I talked to Dan at Mach V a while back and he said that a cat-back will provide a gain, but you will pick up about 10 more whp at the wheels with a TBE.

I'll probably go with the SPT cat-back because it won't void the warranty if I have it installed at the dealer. I'm also going to go with the new SPT CAI. According to Subaru's information, on the STi the SPT catback, CAI, and heat shield will net around 45 hp/25 ftlbs tq.
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post #7 of 20 Old 10-25-2006, 10:34 PM
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not to give any info on how to get around the warranty issue, but if you do a tbe , and keep the stock exhaust in one piece, all you have to do is a quick re install if you have a warranty concern. as for maintenance, subaru does not require you use the dealership to do your routine oil changes, etc. just don't take it in with mods on car.
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post #8 of 20 Old 10-25-2006, 11:31 PM
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some dealerships are so tight! theres a local guy here in CT with a 05 sti and he has EVERYTHING done to his car, tbe, boost controller, bov, k&n short ram, the inside of his car looks like nasa, and he still brings it to the dealership for service and repair, no issues!
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post #9 of 20 Old 10-26-2006, 12:41 AM
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When the dealer found about my tbe, they only voided my emissions warranty, not the whole thing. They said the only reason they did that was because it was cat-less. Just like johnnycamp said just keep your stock tbe and put that on when you go to the dealer, or emissions testing.
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post #10 of 20 Old 10-26-2006, 01:09 AM
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The service manager to me.
"Son, you do know your warranty is basically gone, right?"
"Yep, but you're gonna keep giving me free oil changes right?"
"Yeah"
"Then what's the problem?"

Life is so much easier....

Brent
2007 Satin White STi, 1989 Nissan Sil-Coupe, 1998 Toyota 4runner (to be built..)...
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post #11 of 20 Old 10-26-2006, 01:43 AM
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Quote:
Originally Posted by awd>fwd
The service manager to me.
"Son, you do know your warranty is basically gone, right?"
"Yep, but you're gonna keep giving me free oil changes right?"
"Yeah"
"Then what's the problem?"

Life is so much easier....
i would have put up a little fight, just a little one! but...who passes up free oil
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post #12 of 20 Old 10-26-2006, 01:45 AM
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Quote:
Originally Posted by kh15
i would have put up a little fight, just a little one! but...who passes up free oil
Think about what part of the warranty I can get?

Drivetrain, no, tranny is modded
Electrical, no, my double din NAV and full stereo system takes care of that
Emissions, nope I removed cats
ECU, nope modded
Suspension, nope, modded...
Interior- nope, modded
Paint, nope, rallied.

Brent
2007 Satin White STi, 1989 Nissan Sil-Coupe, 1998 Toyota 4runner (to be built..)...
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post #13 of 20 Old 10-26-2006, 10:15 AM
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I put a cat back on my car, with the three inch, with a magnaflow muffler and stuff, I noticed night and day with quickness and crips response in the throttle, as well as a faster spool.

True it might not gain a whole bunch, but theres more to a catback then sound.
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post #14 of 20 Old 10-26-2006, 01:43 PM
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With the new accessport coming out flashing the ECU won't be a problem for warrenty. So I would add that to your small mods list. I'm in the same boat you are with my 06. I'm planning on getting the SPT exhuast, SPT short shifter, SPT sway bars, and the accessport. That should tie me over for the next couple years until the 08-09 STI comes out or the new GTR.

77 280z, 84 300zx, 06 WRX TR
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post #15 of 20 Old 10-26-2006, 04:10 PM
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Catback=waste of $$ unless you are looking for sound or looks...$600 for maybe 5-10whp is not worth it imo.
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