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Amazingly enough, these two words are synonymous with their point of connection. A Cat back, starts from the last cat and works it's way back. Just as the Turbo Back exhaust starts from the Exhaust side of the Turbo and works its way back. The uppipe is before the Turbo, so there is no uppipe work done on either of these exhausts. There is quite a bit of difference between the two exhausts, anywhere from 20-30 awhp to be exact. The stock muffler is not all that much of a restriction, maybe 5 hp max. The Catalytic Converters on the other hand.....
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