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Stock cat-back, how much power and I losing?
Stock cat-back, how much power and I losing?
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Old 07-18-05, 10:59 AM   #1
Cadence
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Default Stock cat-back, how much power and I losing?

I am running EM @ 17.5psi and a COBB DP with cat but I still have the original STi cat-back exhaust. How much more power am I missing by not running an aftermarket 2.5" or 3" exhaust? I wanted to keep the car quiet but if I can gain 10-15hp from a full TBE it might be worth the hurt ears!

Anyone know?
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Old 07-18-05, 01:53 PM   #2
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The catback isn't going to make much of a difference- the DP is the best way to make power, especially catless.
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Old 07-18-05, 02:07 PM   #3
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Down pipe and stock catback is fine on the stock turbo.
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Old 07-19-05, 06:21 PM   #4
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Quote:
Originally Posted by JDM-STI
Down pipe and stock catback is fine on the stock turbo.
No doubt, BUT, how much more power would I get with a 3" cat-back vs the stock one?
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Old 07-19-05, 08:10 PM   #5
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My guess would be only a difference of maybe 5-10 whp PEAK (top end).
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Old 07-20-05, 01:37 AM   #6
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Quote:
Originally Posted by Stee
The catback isn't going to make much of a difference- the DP is the best way to make power, especially catless.

tests have shown little hp gain differences between going with a catless downpipe over catted. im looking for little noise so i will probably go catted.
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Old 07-20-05, 05:33 AM   #7
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I have nearly the same set up - I do not believe based on COBB's statements that a full TBE will do more than a K&N panel filter would to your HP.


COBB was pretty unspecific when asked exactly how much a Stage II install would suffer sans a full TBE
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Old 07-20-05, 03:11 PM   #8
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A catback on an STI gains 8-15whp generally.
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Old 07-20-05, 03:20 PM   #9
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Quote:
Originally Posted by import111
A catback on an STI gains 8-15whp generally.
8-15 WHP sounds quite high for a catback. Maybe crank but definitely not whp.
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Old 07-20-05, 03:23 PM   #10
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Quote:
Originally Posted by JJ18Sniper
8-15 WHP sounds quite high for a catback. Maybe crank but definitely not whp.
I'm totally with Sniper here. Not much gain if any without proper tuning. No, I'm not saying tuning is required here either.
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