I have the stock 2 1/4 intermediate pipe on a system with hooker shorties (3 inch collector) and 3 inch Y pipe and a 3 inch high flow cat - now i know this is a problem because my car has as much torque as my parents minivan -well maybe a little more -
im planning on going with a full 3 inch exhaust in the next month or 2 - I was just wondering if having a 2 1/4 inch inter pipe comming out of a 3 inch cat was making more back persure or exactly whats it is doing. Also I wanted to know if a full 3 inch exhaust with the headers is too much for a 91 LB9. thanks

Alan

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91 z28 lb9 5 speed - hooker 1 5/8 headers - high flow cat 3 inch exhaust - home made ram air - tpis airfoil - dual chamber flowmaster - car used to be fast - lt1 auto killer - had a stock re-build on the lb9 - and now it sucks a$$