Eric523 did a nice custom exhaust on his 3.6L monster Boxster. It passed the 92db limit at Laguna Seca so it must not be terribly loud. He is in SoCal and his car is extremely fast.
3.6L Boxster GT Racer
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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