I would talk to a muffler shop in your area, they would know how to give you what you want while protecting your warranty.

 

I have an 07 Silverado and just replaced the muffler today. I got a magnaflow, its sounds alil throatier on start up and a great sound upon givin her some gas. It really doesnt have alot of resonance in the cab while cruising down the highway though, which is EXACTLY what I wanted!! I couldnt be happier w/ my purchase, and the wife likes it too!

 

thanks fellas

 

I did a muffler replacement on my 03 silverado, just the muffler... i put a super 40 series muffler on mine, it sounds freaken great, especially on accelerating...definitely Flowmaster though, don't waste your time at a muffler shop, your pipes are probably going to be 2.5" so get a 2.5" ID muffler... Any questions let me know

 

my brother in law did one on his truck and ther eis actually a magnaflow part number that is a direct fit, i will see if i can find the part number, if not maybe someone can post it

 

i think a flowmaster would be perfect especially if your just doing a muffler replacement get a big block 70 series not too loud and a nice mellow sound, sounds great with the 5.3's

 

super 40 flowmasters sound amasing on my pickup, no pop just deep mellow sound