Like he said its all about preference but I can vouch that on the 4.9 (inline 6) most performance mufflers, glass packs included, seem to sound like they're buzzing. So you can have a deep throaty tone but it'll sound, quoting many users on here in this, like an angry bumble bee when you get on it. On my truck I cut the exhaust off after the first cat where it's 3 inch pipe. It has a deep throaty tone and sounds really mean and intimidating but when you get in the higher rpm range it has a really obnoxious drone that, if you windows are up, almost makes your ears pop when you shift.
As for the headers, depending whether or not your truck has the one or two piece manifolds, they have very good flow and you will get very little if any power gains. The two piece are very free flowing whereas the one piece is more restrictive. Also if your truck has the more complicated emissions stuff on it, I believe it's just 95 and 96 but anyone feel free to correct me if I'm wrong, you will have to bypass it to put aftermarket headers on. The cons far outweighs the pros in that case.
Last edited by Mista_Breeze; 02-27-2014 at 02:52 AM.