I got a 87 Trans Am 350 TPI and my cat is ratteling bad and I either need to replace it with a high flow one or just remove it and put a pipe in it's place. I'm in Florida so there's no emmision checks here, but I've heard that if I remove the cat I'll lose power with the TPI, Is this true? Does it need the back pressure? What was anyones experince by removing the cat on a TPI engine? What was it with a high flow cat?I've already removed all the emissions crap off my car. Any suggestions would help. Thanks, Jason

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350 TPI, 5-spd, 3.73 gears, Posi-Rear, LT4 Hotcam, 1.6 Roller Tip Rockers, Accel Intake, Ported SLP Runners, Ported Stock Plenum, Ported Cast Iron L98 Heads, Coated Hooker Headers, 52mm Edelbrock Throttle Body, 24# SVO Injectors, SLP Cold Air Intake, Holley AFPR, LS1 Aluminum Driveshaft, Flowmaster Exhaust, Taylor Wires, MSD Coil,
Engine pic at http://albums.photopoint.com/j/Album...410&a=13413975

 

i have a pipe in place of my cat and i noticed a gain. it will allow your car to breath better up top. you may loose a little low end torque but it won't be too noticable since it is a tpi and already has good low end power.
i say take it out. you can always put a new one in if you don't like it but save your money for now
Andrew

 

I removed mine and didn't lose any torque.

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Shoot Shoot!!!!!

 

Id remove, dont forget to weld in an oxygen sensor!

 

A good high-flow cat is under $100 these days. Be conscientious of the air that we all breathe and install a new high-flow cat. Unless you are highly modified, you won't see any loss over no cat, and certainly won't vs. a stock cat.

--andrew