I have a regular muffler...u think i should get the Gmpp cat back exhaust...and add a downpipe and header or i should just keep the muffler ....and just get the downpipe and header????dou da muffler get any hp gain?....plus if i get all those goodies do i need to get it tune or am i good to drive when i get it installed?

some advice would be good

 

Full exhaust FTW!

Cat-back > muffler

 

thanks i was think that...plus it would have a better sound and 12 horsepower gain like says on some vendor websites...

 

heres what you do do what i did. get the performance exhaust from gm. the price is higher now cuz the sale is over so youl pay about 480 for it. i paid 400. get the CA header. and the Ca dp. put it all on the go for tune hptuners unless your putting more stuff on. anything else you need leme know.

ryan.