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In order to get my recently purchased 79 registered, I need to put a catalytic converter on. Currently the exhaust consists of headers with straight pipes, no mufflers. The BMV says two cats are fine. What setup should I use? Dual cats and dual mufflers. Dual cats and no mufflers. What products are recommended? Does anyone have experience with this sort of thing?
Better check with the DMV again. Federal law states that installing dual cats on a car that originally had a single cat is illegal.
I have run into that as well.
My '89 IROC had a factory 2 cat setup into a 3" pipe and I ran it without a muffler for a while. It was a "tinny" sounding exhaust system. Kinda grated on your nerves as it reved up. I recommend some Walker high-flow cats (got mine from Jegs) and some really open flowmaster type mufflers to resonate the sound.
No joke ... I recommend making some more connections ... find out who'll fudge the inspection/just sign-off on it in exchange for?
Be careful here. I'm not saying don't, but if you've had it inspected and it failed, there is now a paper trail. If another inspector passes it and DMV (SHP in Missouri) catches it they WILL reinspect. The guy that passes it will lose his license, and you both get to pay fines.
California DMV is particularly **** on these issues. Whether you are effecting the emitting gases, even in a positive way, is not their focus- it's if the system has been altered in whatever way. Therefore, putting in dual cats on a true dual system is patently illegal, because it is altered from the original dual Y into single cat and Y back to dual system. Even tho common sense says two cats would be equal or better than one, emission-wise.