...but, friends who do report loud, and drone.
YMMV.
BUT, all two piece mufflers on 986 Boxster have a drone at highway speed that will drive you batty.
The reason is because the Porsche engineers designed the factory muffler to be part of the overall powertrain's harmonic balance at speed. That big, single, heavy muffler acts as a tuned part of the entire powertrain and absorbs the vibration and sound harmonics as everything spins and vibrates.
That's why all the aftermarket mufflers that don't exactly copy the mass and shape of the factory muffler drone and will give you a headache on a long highway trip.
THE solution for a real world, every day useable, cross-country driving vacation Boxster 986 is the FVD Brombacher "Sound Version" muffler.
It's expensive, but it is made of a higher grade of stainless steel that keeps its polished finish for life, does not give you a headache on a long trip, and sounds great, with a faint burble and pop on lift throttle that sounds even better, with LESS drone, when paired with secondary cat delete pipes.
Save your money and buy one and enjoy life.
Good luck.
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