OK,I have replaced my entire exhaust system…headers to tips. I added American Headers who claim 25= hp increase. I kept the OEM Cats since they were so high flowing from the factory, added entire Magna Flow exhaust, which may add 10HP. Added in intake relief with a Soler throttle body and Blue Attack air filter combo. Did all of this make a difference? You bet! Seat of the pants, you bet… my Z51 is quicker and more responsive. The headers add quite a bit of low end growl to the exhaust. If I changed out the cats, it would be far too noisy for my liking. As it is, I leave the garage door closed when doing a cold start for my neighbour’s peace of mind. Does the car feel better, go better and finally sound like an “exotic,” YOU BET!It would be an alternative over just a high end exhaust for the same $?
I am talking about the lease expensive of the combos; Hookers headers and cats.
One may actually add a few more hp? And it would make it sounds more aggressive with the stock exhaust that you want to achieve with the aftermarket system?