cant go wrong with borla. but it just depends how much $ you want to spend. as far as warranty....its just a catback. and most exhaust companies have warranties of their own on the systems. borla is the manufacturer who makes the gmpp exhaust system that you can get through gm. but i believe the only thing you can get it axle back mufflers and tips. its not really a catback. but even the borla catback i have is the same diameter as the stock system. so you may be fine just getting gmpp axle back mufflers if your concerned about the warranty.
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