It's a matter of taste, that's for sure. I've heard a Flowmaster on a 4.1 V6 in a
Delta 88, and I thought it sounded a bit off. I did run an '81 Monte Carlo with a 229 V6, and mainly because the old muffler rotted away at the inlet, I put on a dynomax Super Turbo muffler. It had a deeper tone under acceleration, but not over the top, and fairly quiet at idle and cruise speeds.
Are you doing this for performance reasons, of more for the sound/looks? As several on here have pointed out, there aren't many that modify the V6 cars simple for the fact that:
1) It won't be as fast as a V8
2) The parts are more expensive in general than, say, building a Chevy 350.
I like to play with them for the simple fact that people generally don't mess with them. Plus, even if not as fast as a V8, I like to look at the puzzled look on people's faces when I tell 'em it's a V6. Even better when you tell 'em it's the CHEVY V6 and they look at you like you have two heads!
With what you mentioned, though, I'd attend to the smoking and leaks and such before going too nuts with it. But if it were me, I'd go for it with a Super Turbo, then a hi flow cat (or gutted or removed depending on how legal), and maybe a K&N and a good set of wires and a good cap and rotor. You may only get another 25 hp or so, but when you only have 110 to begin with anything helps!
😀
My two cents, for what it's worth.
Cheers,
Aaron