I have decided against headers sincd no one around will install them, and i dont want to do it myself. I want to keep my flowmaster muffler, but i would like to get a hi flow cat and a catback pipe to the muffler. My exhaust shop in town can only get 3 inch catback pipe..will this be ok? right now i have 2.5 inch. will the 3 inch make my car run poorly, will there be ample back pressure so as not to damage the engine. essentially, will this help or hurt or neither???I also was wondering where i could find a hi flow cat???

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1991 WS6 Trans Am
Dark Green Metallic
Camel interior
305 TPI
TH 700-R4, Auto
T-Tops, PW, PL, PM
Keyless entry, alarm
Flowmaster Muffler
Monza Dual Tips
K&N Filter

 

3 inch will be fine. in fact its pretty standard upgrade. hi flow cats you can get anywhere, jegs, summit, thunder racing, muscle motors(i think), muffler shop, etc

ask the muffler shop if its mandrel bent....i bet it isnt.

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 LTs, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo here...but not installed yet)
MacEwen Motorsports White Gauge Overlays
14" K&N X-Stream Open Element
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window
http://www.geocities.com/esvalenz

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!

"Just because I've done it, doesn't mean I knew what I was doing!" - Me

 

The pipe is mandrel bent. He wants 100 for it, plus 30 to install.

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1991 WS6 Trans Am
Dark Green Metallic
Camel interior
305 TPI
TH 700-R4, Auto
T-Tops, PW, PL, PM
Keyless entry, alarm
Flowmaster Muffler
Monza Dual Tips
K&N Filter

 

Get yourself a 3" in-out converter from random tech it flows very well.