2.5 vs 3

[1985olds]

Good afternoon everyone,

I broke a hangar on my exhaust and unfortunately, I think that might be the last straw for this system.

Car is a g body with an NA LS3/tremec magnum. On the dyno the car made 500.1/475 at 5900/4xxx to the tire through a 2.5" exhaust.

Now that its time to redo the exhaust, I'm looking for opinions on 2.5" vs 3" pipe. Thank you

[Lonnies Performance]

At your power level a 3" should be of benefit, but I'm not sure what system you presently run or the noise level you are accustomed to.

3" pipes tend to be louder, so there is a tradeoff.

[1985olds]

At your power level a 3" should be of benefit, but I'm not sure what system you presently run or the noise level you are accustomed to.

3" pipes tend to be louder, so there is a tradeoff.


Thank you. Current system is 2.5" with an x pipe and borla pro xs mufflers, exiting behind the rear tires

[68Formula]

Run 3" through the mufflers and then reduce to the 2.5" tailpipes you already have. Will make the same power with less increase in noise (assuming you also run an X pipe and 3" Pro XS mufflers).