Re: Engine Swap
It really depends on what you're going for in sound, and what type of mufflers you're going to run. If you want a deep, throaty tone then go with a bigger pipe like 2.5 or a 3in. If you want more popping and cackling then go with smaller like 2 or 2.25in. On my '77 Traveler with a 345 I'm running 2.25" right off the exhaust manifolds, then it turns into 2.5" (as big as I could go and still fit the passenger-side pipe between the transfer case and the frame) then turns into 3" behind the transfer. The 3" runs into dual flowmasters with 3" turndowns off the back of the mufflers. That has worked out great for me, I love the sound and performance they put out with that setup. It's really just a personal preference on how you want it to perform and sound.