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Old 08-13-2003, 04:09 PM   #1
Scooby Newbie
Member#: 38045
Join Date: Jun 2003
Default Racepipe or Catpipe on exhaust?

What do you suggest? Has anyone tried either? Any results? If I do racepipe, is there a chance that I am damaging the car?

Any advice appreciated!

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MontrealSTi is offline  
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Old 08-13-2003, 06:41 PM   #2
Scooby Specialist
Member#: 32576
Join Date: Feb 2003
Location: Stevens, PA
04 STI


With a racepipe, you can:

run leaded gasoline with very high octane (more HP)
Get about 5HP more (this scales with power levels though)
smell your catless, polluting ass in the vehicle behind you
risk "staining" your clearcoat on the rear bumper
barely hear yourself in the car
never, ever legitamatley pass inspection
lose 5lbs from exhaust weight
pay about $100-$50 less for the exhaust

I think I have covered everything here and it is up to you to decide. A catted system has all of the same points, but reversed.
Neither will damage your car right away, but the exhaust could (prob not) shorten the life of some components due to the engine making more (10%) power. You prob won't still own the car at this point though (read 90K miles).

I have had both on my old WRX. I started out catless then went to catted. The positives of catted greatly outweigh the positves of catless for what I was doing with the car. Sounds simple, but the "race pipe" is actually intended for "racing" only. So if you don't have (or don't plan on having) a 5 point harness in your car with a 1 piece bucket seat, go catted. If you plan on dragracing or autocrossing frequently, go for it.
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Old 08-13-2003, 06:48 PM   #3
Scooby Newbie
Member#: 38045
Join Date: Jun 2003

Thanks for the response, I ended up choosing cat. The car is still a daily driver.

Thanks again,

MontrealSTi is offline  
Old 08-13-2003, 07:19 PM   #4
Scooby Guru
Member#: 23676
Join Date: Aug 2002
Chapter/Region: NESIC
Location: de_dust and Orgrimar


You forgot to tell him the other joy of running leaded gas

Replacing your 02 sensor every 100 gallons or so.
That'll cost ya a few hundred right there.

Yes run a race pipe, yes run leaded, just run it only when you need to.
Run unleaded for daily driving.
Davenow is offline  
Old 08-13-2003, 07:48 PM   #5
Scooby Specialist
Member#: 10972
Join Date: Oct 2001
Chapter/Region: South East
Location: Tampabay, Florida
2004 STi (fuxor3d!!)
2004 Forester X


As already pointed out one really can't run leaded gasoline as it will destroy your O2 very quickly. The catless pipe won't make the car that much louder at all(from experience). You also most likey won't pass inspection in most states with a high flow cat either soley based on a visual inspection. Once you get a proper tune odors shouldn't be more of a problem than with most normal slightly older cars on the road. In my experience the high flow cats don't do a very good of scrubbing the exhaust either.
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Old 08-13-2003, 09:45 PM   #6
Scooby Newbie
Member#: 8281
Join Date: Jul 2001
Location: BC
1967 Alfa Romeo GTA


Originally posted by lstepnio
You also most likey won't pass inspection in most states with a high flow cat either soley based on a visual inspection.
If you put a resonator where the cat is supposed to be, most places will think it's a cat. And modern cars when properly tuned an not too modified will often pass without a cat. I am talking from experience. At the same time I would discourage anybody from running a daily driver without cat.
Alleggerita is offline  

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