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The top speed muffler sounds like complete garbage IMO. Not only is it extremely cheap (something was very loose internally after 3000 miles), but if you have the hearing sensitivity greater than or equal to any 75 year old human, you will be deaf in no time. No to mention the drone from 1700-3000 rpm. I sold the muffler for 75 bucks and a huge verbal warning about how much of a POS it was.
I then bought a '03 boxster S exhaust for $100, drilled me some holes up inside the outlet pipe area and can't complain one bit (just be sure to buy an adapter to mount the later model year pipe).
I also tried out some top speed headers. The fit was not great...not even good. I had < 1mm clearance between the headers and the bottom of the crankcase at one point. The flanges where the headers met the cat pipes also leaked like crazy no matter how many ways you adjusted the connection. If the fit was better, I would have kept the headers on but because of the endless exhaust leaks, I opted for stock headers and the 03S pipe.
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