My 90 formula has duel cat setup and I am having troble finding a cat back system for it. Summets cat backs are for single cats. Man this is alot of cats hehehe.

Thanks Ron

 

Hey I had the same problem on choosing a cat back that would fit dual cats, but after a while I just got an 80 Series flowmaster muffler. It wasn't at all what I expected so now I'm going to just get the Hooker cat back and do some modification. I have read many great things about this hooker (mostly from Mark) but I'm gona give it a try and hopefully its what i'm lookin for.

Scott

1991 Z28
350 TPI
Gutted air boxes
Air foil
Flowmaster 80 Series Muffler
Fastchip
14.4 @ 95.6 mph

 

Same problem here on my 91'. some that I found were mufflex, mac, flowmaster, dynomax, slp.

 

Think I am going to put a 80 series FM on it. Heck the stock pipe looks like 3" from the cat back.

 

The intermediate pipe is 2 1/2". My son bought a flomaster cat'/back package from summitt. It's a dual converter 3" setup with dual outs, one on each side. It's the AMERICAN THUNDER package.

 

Darn the pipe from the cats back to the muffler is 3" as the lord is my witness its 3" how do I know? the darn 2 1/2 is toooo small and its all stock. I got the car from the man who ordered it in 1990 and has never done a thing to it. Go figure. I had a muffler shop stick a 80 flowmaster on it with new tips for $150. he said he has seen a few stock 3" but not many. I am sending summit back its system monday