performance exhaust

I have a '91 s10 and the engine is bored out so i was wondering if anyone can help me by tellin me if glasspack mufflers are a good idea.

no glass packs sound like crap on 4.3s go with mides ravin if you can find one. or flowmaster 40s do not get delta flow just the super 40 will sound good heres a clip of super 40s on a 4.3 s10

http://www.youtube.com/watch?v=-eQGNdUdsno

glaspacks sound similar to flowmasters on a 4.3 but with a slightly raspier tone and they actually hurt performance a bit due to their straight through design. between the two a flowmaster would be a better choice if you want a loud tone.

also duals have a better sound but dont really help performance i run a 3in in and dual2.5 out and it sounds very good best sounding 4.3 around here my exhaust helpt my performance

you really don't need anything larger than 2.5in on a 4.3.