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Old 04-14-2005, 08:21 AM   #1
05rswagon
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Default 05 sti exhaust fit a 05 rs

will a 05 sti cat back bolt on to an 05 rs without cutting and pasting
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Old 04-14-2005, 08:36 AM   #2
ej25power
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Probably not.
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Old 04-14-2005, 07:03 PM   #3
goNads
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nope, it will not.
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Old 04-14-2005, 07:13 PM   #4
Handsdown
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you'll have to weld an RS flange to it.
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Old 04-14-2005, 09:22 PM   #5
05rswagon
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ok thats easy enough
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Old 04-14-2005, 10:29 PM   #6
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u need an adaptor, the flange is rotated like 30 degreese and is about 4 or 5 inches short. i had one made and can run any wrx exhaust on my rs
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Old 04-14-2005, 10:51 PM   #7
cabe
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^^^What he said.^^^ it's easy, 20 mins and 20 bucks at an exhaust shop.
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Old 04-15-2005, 05:28 PM   #8
goNads
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^^^^
true dat. it's what i've done.
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Old 04-15-2005, 06:08 PM   #9
Sober_One
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As a note: a muffler designed for an engine with a turbo will not sound the same on a N/A engine. The turbo actualy causes some restriction and this reduces a bit of the noise.
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Old 04-15-2005, 06:29 PM   #10
Handsdown
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true, but the STI muffler is still REALLY QUIET on an RS.

there's a slight, muffled hum noticable at around 1250-2500 rpm, but other than that it's not noticable in the least without the window down... and even then it's not 'loud' in any way.
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Old 04-18-2005, 06:15 PM   #11
goNads
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i'd call the hum a drone... but it still drones less than a wrx axle-back.

Handsdown, what mid-pipe are you using? i tend to think the wrx resonator is what causing my drone.
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Old 04-18-2005, 06:21 PM   #12
05rswagon
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screw it Im just gonna forget a muffler and get a straight pipe........................... Im kidding
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Old 04-18-2005, 06:47 PM   #13
Caplin 2.5
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haha hands is gonna cringe when he reads this but you could always remove the muffler like muah
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Old 04-18-2005, 07:02 PM   #14
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yeah, that was a definite cringe.

my midpipe was custom crush bent at a performance muffler shop that's in my town(greensboro), so it's 2.25" and pretty darn straight. resonatorless, too.

taking the muffler off is not a good idea because all the exhaust gas will just sit under your car and creep up into all the cavities of the undercarriage, which... well it's just not a good idea to have pockets of exhaust gas anywhere.

if you don't think there are that many gasses coming out, stand behind your car with pants on and at idle, feel it chugging the gasses out...

on second hand, don't do that. you'll probably burn yourself. just don't take the muffler off. if you want a completely unmuffled exhaust, just get a straight pipe made that goes all the way out the back.

in fact, if i really wanted something loud, i'd probably get equal length headers, a high-flow cat, and a straight pipe with a resonator in it where the muffler usually is. then a rolled tip the same size as the pipe and call it done.

but please, don't just take off the muffler.
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Old 04-18-2005, 07:09 PM   #15
05rswagon
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hehe maybe Ill take the glass packs off my 72 buick and put that on instead
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Old 04-18-2005, 11:37 PM   #16
Caplin 2.5
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haha hands is definately right don't do that, im just really crazy so its all right for me to do it. No problems yet..... still waitin for one haha.
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Old 04-19-2005, 05:07 PM   #17
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Hmm, what size is the STi's piping? AFAIK it's 2.5" stock....

That'd be okay on an RS but just a bit too big. If it's 3.0" stock then it's WAY too big.

=S2=
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Old 04-19-2005, 06:48 PM   #18
goNads
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it's 2.5" OD... that'd be like ~2.37 ID (assuming most 2.25 OD pipes are 2.12 ID)
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Old 04-20-2005, 11:25 AM   #19
DoggoD
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I would worry about the torque loss by going to big. Torque is good!!!
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Old 04-20-2005, 02:12 PM   #20
goNads
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correct me if i'm wrong... but there won't be a loss of torque. just a shift in the band.

further, it feels, like it pulls harder than the wrx axle-back i had on before. also, if you take a closer look at the actual sti axle-back you'll notice the flange area is indeed 2.5" OD... bit just half a cm before the flange it looks to be significantly smaller.
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