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Old 04-05-2004, 08:40 PM   #1
WRXVII
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Default Expected hp gain from gutting highflow cat?

Currently my car has BPM-GT TBE and I am thinking about gutting it out. Anyone has experience gutting out the midpipie highflow cat? what's expected gain in terms of hp and improvement in turbo spooling?

Thanks in advance, Tim
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Old 04-05-2004, 08:50 PM   #2
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~10-15 pulling the stock cat.... id say ~8-10 with a high flow.

And a its going to get louder.
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Old 04-05-2004, 11:52 PM   #3
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8-10whp is optomistic unless the cat is of poor quality. More sound for sure and you car's going to stink too.
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Old 04-06-2004, 12:19 AM   #4
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Will it smell that bad?
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Old 04-06-2004, 12:28 AM   #5
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Quote:
Originally posted by WRXVII
Will it smell that bad?


Not that bad, but I let my WRX idle for about 5 min in the garage (with the door open) before I drive it if it's been sitting for a while and you get a lil light headed if you hang out in there too long.

I'd run a cat if more options were available...$150 for my used Invidia DP or over $500 for a cat'd unit...that's a no brainer to me. Hell high flow cats are $40-60 NEW, so why the price gouging for them?
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Old 04-06-2004, 05:56 AM   #6
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I have the stock uppipe and a catless turboback but I notice no change in smell or any kind of bad smell that many people have mentioned? I don't think removing a highflow cat would make much of a difference in this regard.
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Old 04-06-2004, 08:46 AM   #7
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Cobb got ZERO difference in power between their catless downpipe and the high flow cat downpipe. Like was said previously, if you have a good high quality cat, you will see no gains.
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Old 04-06-2004, 08:56 AM   #8
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Random Tech Cats show virtually zero gains without thier cats in several of their tests. 'Course these are their tests; I'd still estimate less than 10 hp, probably just ~5 hp.
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Old 04-06-2004, 09:00 AM   #9
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Quote:
Originally posted by WRXVII
Will it smell that bad?
Only under hard acceleration, or with a poor tune. There are still pollutants galore, but things like Carbon Monoxide are odorless.

I should add it will smell bad for the people behind you; kinda funny in a drag race but annoying as anything in traffic.

Tom
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Old 04-06-2004, 11:38 AM   #10
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I would think anything up to a stage 4, you would see little to no difference with a high flow cat, provided it was good quality.


After that the losses would start compounding.
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Old 04-06-2004, 12:09 PM   #11
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I'd sell the cat to someone lookin for one and buy a straight through setup.. /shrug

Scott
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Old 04-06-2004, 01:58 PM   #12
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Quote:
Originally posted by Dakken
I'd sell the cat to someone lookin for one and buy a straight through setup.. /shrug

Scott
That's the best idea to me too. Gutting you cat (assuming it is a good high flow) won't give much, if any, gains.
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Old 04-06-2004, 04:24 PM   #13
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Quote:
Originally posted by SlideWRX
Only under hard acceleration, or with a poor tune. There are still pollutants galore, but things like Carbon Monoxide are odorless.

I should add it will smell bad for the people behind you; kinda funny in a drag race but annoying as anything in traffic.

Tom


Catless vehicles I've owned/driven stink pretty much all the time from what I've noticed. It's more apparent in openloop but even with mine in closed loop and ya hop out you can tell by smelling the exhaust it's catless. I can easily tell if a vehicle is catless by the sound and smell it produces.
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