If you don't live in the "Rust Belt", and don't want to spend a lot of money on high end muffler, the Raptor Turbo from Kragen's is cheap(under $24). I run one under both my mod'd 3.0 and stock 22re, and it has a nice mellow throaty sound behind each engine, more so behind the 6cyl. What I like about the muffler is that it is quiet on the trail, and only really here it when in the throttle.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed