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Old Apr 12, 2005 | 06:58 PM
  #1  
arejay86's Avatar
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From: Sterling, IL
Car: 1988 IROC-Z
Engine: 305 TPI 30 over
Transmission: 700r4
Cat questions

ok, i'm thinkin of either choppin the cat con off my car. i've been told that this is good for performance, and that its also bad for performance. which is it. second, if i do chop it and just put in a straight pipe where it used to be, will the car throw code that would cause the check engine light to come on? if so, how do i get around it
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Old Apr 12, 2005 | 06:59 PM
  #2  
V8 Slayer's Avatar
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Joined: Dec 2004
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From: New York
Car: 91 Firebird
Engine: 3.1 V6
Transmission: TH-700-R4
just get a high flow one...
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Old Apr 12, 2005 | 09:10 PM
  #3  
DJP87Z28's Avatar
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From: Florida
Car: 1987 Black IROC-Z (SOLD)
No SOTP gains made by removing the Cat. Just buy a hi-flow one and keep the car emission legal.
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Old Apr 12, 2005 | 09:45 PM
  #4  
5.0Camaro's Avatar
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From: Fontana, ca & saint clair shores, MI
Car: 1991 camaro Z28
Engine: LS1
Transmission: T56
Wont really loses anything with a aftermarket cat(1-3 rwhp) as long as you get a good flowing one(random or carsound). You'll lose about 10-12 rwhp if your pushing more hp like around 400+ rwhp. I would just go with a pair of good aftermarket cats and not worry about it unless your pushing a lot of power.

Justin
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Old Apr 12, 2005 | 11:37 PM
  #5  
IROCThe5.7L's Avatar
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Joined: Jul 2001
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From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Re: Cat questions

Originally posted by arejay86
ok, i'm thinkin of either choppin the cat con off my car. i've been told that this is good for performance, and that its also bad for performance. which is it. second, if i do chop it and just put in a straight pipe where it used to be, will the car throw code that would cause the check engine light to come on? if so, how do i get around it

It is not bad for performance. It is for emissions though, if you get tested where you are located. There will be no SES light if you do this. That is on OBDII cars (1996 to current).
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