Initially, I could tell that its sounds better at all mid to high RPM's and I think that it helps out on the performance as well. Not to mention each one of those cats weighs about 20 lbs.
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Jose Vara
08 Cayenne S - Black/Black
03 911 Carrera 4 - Red/Brown, Tiptronic
02 Boxster S - Black/Black/Black, 6 spd.
87 944t - Black/Tan 5 spd.
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