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Old 04-29-2004, 01:15 AM   #1
catchthex
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Default Rally Car Exhaust

Does anyone know what type of exhaust system the WRX's on the rally circuit use? Those things sound amazing!
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Old 04-29-2004, 01:36 AM   #2
Aphex28
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my guess is just a straightpipe and no cats
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Old 04-29-2004, 01:45 AM   #3
nKoan
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Yeah, probably straightpipe, no cats. I would think that it can't have cats because the anti-lag system would just muck them up in an instant (and you get the cool fireballs out the tailpipe).

But, if you look closely, the exhaust on the WRC car is on the passenger side, not on the drivers side like the production WRX. My guess is that it is a prodrive specially fabricated exhaust for the car. You probably can't buy the exact exhaust (and you wouldn't want to considering that you would also need to buy a new rear bumper) but you can buy something very similar.

Last edited by nKoan; 04-29-2004 at 02:17 AM.
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Old 04-29-2004, 01:47 AM   #4
Kostamojen
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See: Miss-firing system

Also see: No you cant use it on your car
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Old 04-29-2004, 01:56 AM   #5
Honkey3k
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Also See again: It wouldnt pass smog
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Old 04-29-2004, 07:44 AM   #6
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from SWRT.com:

"Ceramic coated, lagged with fire-proof material and aluminium covered. Fitted with two, three-way catalytic converters"
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Old 04-29-2004, 09:51 AM   #7
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Quote:
Originally posted by Quack
from SWRT.com:

"Ceramic coated, lagged with fire-proof material and aluminium covered. Fitted with two, three-way catalytic converters"
and costs about as much as a WRX
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Old 04-29-2004, 10:03 AM   #8
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Quote:
Originally posted by catchthex
Does anyone know what type of exhaust system the WRX's on the rally circuit use? Those things sound amazing!
We have 2 different WRXs at my shop right now. One is a SCCA ProRally car and the other was at the Rally de Mexico. They are both version 7 LHD models. Both have the 2 stock cats (remember no stock uppipe cat) and run straight pipe. I believe both these cars are in slightly lower classes, but since your question was kind of open ended this is what you get.

The WRC cars have cats, but they put them as far from the turbo as possible.
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Old 04-29-2004, 10:52 AM   #9
Subie Gal
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my SCCA ProRally car has (from www.ionperformance.com)

stock up pipe

4" bellmouth downpipe into 3" high flow cat
then 3" into 2.5" straight out the back

All rally cars have cats. Required per the rules...

Yep... it's loud...

Jamie
www.subiegal.com

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Old 04-29-2004, 11:01 AM   #10
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Cool shot! I see yellow flames....
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Old 04-29-2004, 11:20 AM   #11
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Quote:
Originally posted by nKoan
Yeah, probably straightpipe, no cats. I would think that it can't have cats because the anti-lag system would just muck them up in an instant (and you get the cool fireballs out the tailpipe).
They got to be street legal to compete usually. They just go through alot of cats if they get screwed up.
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Old 04-29-2004, 01:03 PM   #12
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When I was at Sno*Drift working starts this year Travis Pastrana's exaust had that evil red glow from having the cat about 4" back from the end of the pipe.

nick
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Old 04-29-2004, 01:56 PM   #13
nKoan
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Quote:
Originally posted by afpdl
They got to be street legal to compete usually. They just go through alot of cats if they get screwed up.

Totally forgot about that point. Thanks for clearing that up.
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Old 04-29-2004, 02:29 PM   #14
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Quote:
Originally posted by catchthex
Does anyone know what type of exhaust system the WRX's on the rally circuit use? Those things sound amazing!
PDE makes a Rally specific downpipe, you may want to check it out at www.pde-usa.com .
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Old 04-29-2004, 02:48 PM   #15
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Quote:
Originally posted by Recce01
PDE makes a Rally specific downpipe, you may want to check it out at www.pde-usa.com .
Huh? The only downpipe I see is a regular old catless downpipe. Nothing special.
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Old 04-29-2004, 02:52 PM   #16
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Quote:
Originally posted by mbiker97
Huh? The only downpipe I see is a regular old catless downpipe. Nothing special.
They make a catted downpipe and a downpipe with removable cat. You just have to scroll down.

Oddly enough their "rally spec" downpipe with extra protection is catless.
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Old 04-29-2004, 08:33 PM   #17
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If you see a shot of the WRC Subarus on stage from an angle that gives a good look into the exhaust you can see a CAT glowing red, maybe a foot upstream.

Other WRC cars seem to be similar...
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Old 04-29-2004, 08:53 PM   #18
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Guys, I have a good pic of the WRC exhaust that I took from the 04 Chicago AutoShow.. I hope this pic helps. Looks so mean in real life! The muffler has a quick release spring loaded clip, as you can see from the pic; also it has a special coating( more like a cermic look)..

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Old 04-30-2004, 12:02 AM   #19
Cosworth
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Here are some pics i took at the 2003 NY auto show. You can see that there are 2 pipes going into the rear muffler. Looking down the tailpipe, you can see a catalyst honeycomb offset to the right. Perhaps there are two passages though the muffler, one that is "straight pipe" and another that is routed though that catalyst. Unique way of getting arount the rule perhaps.



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Old 04-30-2004, 12:17 AM   #20
WRXedUSA
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Sweet pics.

That cat all the way back makes for some nice backfires.
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Old 04-30-2004, 01:48 AM   #21
brentlz
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This is what was hanging under a ProRally WRX (my memory fails as to who) at Rim '02: no Cats nor mufflers in sight...only a tiny resonator.


The Prodrive/WRC prepped cars are a different beast...as previously noted, their exhaust exits on the opposite (right) side of the car from the factory exhaust. This is from an '02 car:


Brent.
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Old 04-30-2004, 02:00 AM   #22
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Quote:
Originally posted by Cosworth
Here are some pics i took at the 2003 NY auto show. You can see that there are 2 pipes going into the rear muffler. Looking down the tailpipe, you can see a catalyst honeycomb offset to the right. Perhaps there are two passages though the muffler, one that is "straight pipe" and another that is routed though that catalyst. Unique way of getting arount the rule perhaps.

Interesting they may have a way of switching it from cat to open for street use and for when they are on the stage. I think they only need to be street legal during the transits not sure though.
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Old 04-30-2004, 07:59 AM   #23
LyveWRX
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US Pro-Rally has AFAIK only required Cats w/in the last 2 years, thats why the Rim '02 exaust has no cat.

nick
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Old 04-30-2004, 09:44 AM   #24
jprowland
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Anyone who runs a rally without a cat in the US or Canada, especially the national events, is risking DQ. I've co-driven in cars that have been checked both at scrutineering and at stage starts with an infrared temperature gun.

Not that there aren't plenty of rallyists who don't gut out their cat anyway...Also Subarus have like 3 cats stock from the factory so people often remove 1 or 2.

--
JP Rowland jeremyrowland@mac.com
Co-Driver, Wazoo Racing Subaru WRX, PGT
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Old 04-30-2004, 10:23 AM   #25
bullseye17
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Most group N cars run stock STi (catless) uppipe, stock downpipe and midpipe with gutted cats, and they will run a straightpipe on the rear with a hiflow cat right on the end of the exhaust.
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