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If you do a lot of cross county drives you are probably better off keeping your stock manifolds (to retain heat) and getting a performance 1 in 1 out muffler to keep it sporty but not too loud. I have headers and a stock Dansk muffler on my driver (3.2SS) and it isn't quiet, but not too bad. It doesn't drone like a 2 out would, but I did have a coworker say it was loud in the parking lot the other day. It's definitely louder than the Carrera with the M&K test pipe and 1 in 1 out muffler that I used to drive. With the SW chip that was a solid combo and a healthy performance bump over stock.
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