I would go with a flowmaster muffler setup if I where you or even a decent after market "turbo" muffler .. glasspacks are for teenagers and Okies .. you wont be happy with the noise from them. just my opinion ...Von Warner
I second the skipping of the glass packs. I'm only 18, but have heard that glass packs don't sound that good and get blown out eventually. Get a flowmaster muffler or something. I have the 50 series and its pretty loud, but i have a 350 v8.
For Okies and teenagers? Hahaha. I like that. I guess I'm trashy enough to say go for the packs. It'll sound good if you like how glasspacks sound. It's going to be loud and ratty and they will burn out, but what do you expect for $20?