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2.5" should be plenty. Most of the cars with 3" system that I have seen personally sounded horrible. Too loud and annoying sound.

I am lucky to have a local shop that does ONLY performance work and does mandrel bending. I had a 2.5" all stainless steel system built by them. Very nice work, super thick flanges, uses all factory hangers, TIG welded, muffles and resonators in factory location, and removable X-pipe with V-clamps (so clutch/transmission can be easily removed). He was done with it in a few days. The only drawback was the cost (~$2000).




That's nice. I'm tired of screwing around with exhaust systems.