PartTimeGenius

As I understand it, this should be the last time I'm required to undergo an emissions inspection, so I want to change over to true duals once I pass the final sniffer test. (Dallas guys, if I'm wrong about the emissions thing, let me know!)

Assuming my emissions info was correct, what all am I going to need to make the conversion? I know there's a crossmember with provisions for duals (where can I buy this?) What else do I need to get?

USA SHARK

It depends on how you are going to register and license your vette. If you keep the regular plates, I believe you still have to get it checked. If you go to Antique plates, you don't need emissions or safety checks.

Even though there are certain restrictions with antique plates, they are not strictly enforced.

PartTimeGenius

I intend to keep it as a daily driver, but if what you're saying is true, I'm apparently stuck with that constipated factory exhaust setup. I thought after all this time the emissions statute of limitations would've finally expired. :banghead:

L79vette

http://forums.corvetteforum.com/zerothread?id=805424

A single 3" pipe is pretty free flowing. Equivalent pipe area to 2 1/8" duals, but better than the equivalent duals because each exhaust pulse sees the entire area instead of just half. I'd love to see a dyno comparison of a properly done 2-1-2 system versus true duals.

Look at this: http://www.castheads.com . If you are running exhaust manifolds, this is an eye-opener.

Master Ho

CRUSHER75060 just had true dual exhaust and dual cats installed on his '81. It passed inspection/sniffer in Irving. You might message him for more 411.

terry82

mid -america catalog has a tru dual set up for your car .have heard that it does not fit well with out some work on it . but you could look at it and have one made for your car . the 2-1-2 that you have is not all that bad, the bad part is your cat. replace with the new type or MODIFY yours.