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I just got my Bullets on my one month old z51 coupe..the sound is amazing, although I might be looking into the PRT so my neighbors dont get pissed.. its not as loud as everyone was saying... my cammed evo was significantly louder at idle then this car is now..
I was thinking of going a different direction with a cam/intake first.. and keeping the stock headers and going for a custom tune... not sure how noticable the loping is going to be on the bullets though. I would avoid the dealership all together but I signed up for some oil change program
Check out Speed Incs (www.ls1speed.com) 007 Cam my buddy dyno'd 419 rwhp with headers no cats. This car has very minimal lope, enough that the dealer did not notice it when he took it in for a broken rear end!