Just installed yesterday in my GC limited 2014 a Borla exhaust and K&N intake, first impression very nice sound from the exhaust at low rpms... At high rpms I listen a raspy note, don't know exactly if it is the exhaust or something loose from installation... I am in the process of finding that out
I wouldn't call a cat-back exhaust system a "performace" mod since there's little to no gain in power from an aftermarket CBE. If anything you lose some low end torque. You'd see a greater increase in power with a CAI.
A CBE is mostly for an exhaust note change...i.e. increase in sound.
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