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The only difference in catbacks are when you have a 2+0 or 2+2. BUT...if the exhaust is 3", it will be very loud and raspy on an NA, possibly losing performance. 2.5" on NA is fine, but from what I was told, 2.25" (stock) is the best for NA. The TT's benefit much more from the 2.5" and 3". If you have the 3" and the buyer doesn't want...let me know, I'll take it off your hands.
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