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Marco, if my boxster was a daily driver I would not buy any aftermarket muffler that had two chambers. These all have resonance (loud howling noises that are deafening and women riding with you will absolutely HATE the sound) between 2-3k rpm.
Look for a single chamber aftermarket muffler that guarantees no resonance, and then get the headers from the same manufacturer and you'll love the growl coming from your Pcar afterwards.
This ain't cheap though. You'll gain about 12-18 hp and good sound for $1500.
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