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I have the Borla axle back. Fit and finish are good, I had mine unpolished and the mufflers powder coated. Engine "breathes" better, sounds louder and nicer by about 20% except that it has a drone while cruising at 1900-2000 rpm.
I wish there could be a side by side comparo between a Borla equipped car and Joe Z'd car, to see and hear which is better.
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