Stop in for a cup of coffee

straightlinespeed said

Afternoon all! Question regarding exhaust. My car came with TTI headers, and Im not sure of the exhaust system. However out of the headers it necks down from 3" to 2.5", through some Dynomax Turbo Mufflers which reduces again to 2" at the outlet of the muffler, then out the back of the car.

So for those of you that know exhaust, would I get any benefits out of changing the mufflers and tail pipes to 2.5" to keep it consistent straight through?

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As long as the mufflers stay at 2.5" in and out, the 2" tail is unlikely to hurt anything and may even help at lower rpm.
The exhaust cools after leaving the cylinders. As it cools it increases in density (loses volume). More heat is lost in the mufflers so further reducing volume.
There should be enough velocity at the tailpipes that atmospheric pressure is kept away from the tips from idle to redline. ;)

If the transistion out the muffler is ugly, then just have a shop rework that. If you want to go to 2.25", that would be OK too I think.
'68 and up is easier to run 2.35" tailpipes because fuel tank strap isn't in the way.