3100 and 3400 do sound better than the 3800 with exhaust.

 

I guess that would depend on the quality of the glasspack and the type of material used. I have no doubt that the ones using fiberglass wouldn't last too long. Since it is upstream from the main mufflers I don't think it would change the sound of the exhaust too much. Glasspacks are a straight through design so there's not much sound deadening to begin with.

 

I'm looking for a good aftermarket muffler for my 2007 SS , I'd really like to know if anyone has done this and how'd it sound and notice any difference?

 

ohh boy the 5.3 sounds beautiful, i've heard some good results with magnaflow, im personally a flowmaster guy, i think some SLP Loudmouths would sound sweet too!

you'll definitely notice sound, probably not much if anything for power tho!

 

here is a link to my youtube channel. There are a few videos of the exhaust on there if you browse my videos.

theshocker7525's Channel - YouTube

I have the magnaflow cat back system on my 2007 SS and love it. It sounds great and it seems to have freed up a few HP. I really recommend it.