September 5, 2007I have a 04 GT auto and I'm thinking about changing my piping to 2 1/2", possibly 3". Any pros or cons to this...? Will there be anymore horses? Will it be louder? Thanks for your feed back.
September 6, 2007Are you stock otherwise? With a turbo, less back pressure lets the turbo spool faster, so it should help you. If you're stock otherwise (no stage 1, etc.) you'll probably get the same benefit from a good free-flow exhaust, like a BTG. If you have a boost controller, etc, then go biger than the stock 2.25.
Bigger should be louder if all else is equal - resonators/mufflers/baffles can cure that.
September 6, 2007Yup... just the stock HO turbo, with a K&N cold air intake and a straight through Sebring exhaust.
September 6, 20072.5" would be could for faster turbo spool up, but 3" would be overkill without running a big turbo.