2.5 to 3.0 Exhaust

A 2-1/2 inch muffler, chambered or turbo, is good until approximately 450 hp, (give and take a little here on actual design and manufacturing) the 3 inch should carry another 100hp. The straight through mufflers that you can see unobstructed to the other side will carry a good bit more…. (And sound louder…. LOL)

The 1-5/8 header should be upgraded (for sure) on power levels north of 450. Or a straight through muffler should be used to allow the header to work at its best. It gets a bit dicey to make a call here on the internet without, 1; Knowing the build and purpose and 2; Not having a dyno to work with. This leaves you with the track, so enjoy that! I’m sure that’s going to be a lot of fun.