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Do Cat-Back Exhausts Actually Add Power?
A cat-back changes the sound and sheds a little weight. The power gain is real but small, and mostly comes down to whether the car is turbocharged.
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Exhaust
Catted vs Catless Downpipe: What Actually Changes
One keeps you road-legal, the other is track-only. The difference is a single part, and it decides both the power and the law.
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