Best performance exhaust
 

What's the best performance exhaust for a 90 Toyota Supra Turbo

In my opinion, for the stock turbo, a full open elbow, a true 3" down pipe, 3" test pipe, and just about any 3" cat back would be the best set up. But with a test pipe you will run into issues with meeting emission standards.

3.5" exhaust wouldnt be bad eithier

Theres no point going 3.5"...

LOL..., sure there is.

This way the black crap that builds up on your back bumper takes longer to show up because you spread it out a bit :).