I installed a full dual exhaust with headers and dual cats onto an '84
T/A. The local inspection people said it was okay because a later
model F-Body came from the factory with dual cats. Thankfully there
was no sniffer test in the area because there was no way it would have
ever passed. Sure, a later model came with duals, but the two 2 1/2"
cats I installed couldn't have possibly gotten hot enough to light-off
and clean the exhaust. Not to mention there just isn't enough room
under the floor to fit all those parts. It used to scrape and bottom
all the time.
Edelbrock T.E.S. headers and Y-pipe.
Stock H.O. 2x3 oval catalytic converter, or a high flow aftermarket 2
3" Flowmaster cat back exhaust
That'll be 50 state legal, very high flow, and you can sleep well at
night knowing the emissions won't kill any spotted owls or desert