Improvements on times with exhaust?

[cypress]

about a month and a half ago i put on 2 1/4" straight pipes into dynomax turbo mufflers out to a shinny 3 1/2" tip...i just was able to make it out to the track last sunday. My times before were 15.952 @ 88.14 2.457 60'. Just with the duals i ran 15.731 @ 88.85 2.428 60'. Not a huge improvement but i was happy with it. I'm curious what kind of improvements everybody else has had with their setups

[Rellik]

I never got to see my time changes. Because I got my dual exhaust before I ever went to the track. 3/10ths of a second isn't bad for jsut exhaust. Good Job.

[lowflyn]

I'm hoping to run on the track completely stock if I get the chance here soon. I'm about to put duals on it. I'll see what gains I get stock...