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I bought it, installed ( easy and quick install for my 98 Boxster) it and I'm returning it. The SOUND is excellent, meaner, especially in lower rpm and louder - also a lot lighter than a stock.
What I hated is BOOM/DRONE/VIBRATION 2K-3K rpm. Unbearable and tiresome. My son was begging me "Dad, turn OFF that VROOM" when we were cruising at 2K to 3K. The more throttle in that rpm brackets, the more pronounced the vibration/boom had become.
Top Speed technician told me that this is suppose to change after I drove up to 300 miles...
I did 450 - hurting even more.
I have to add that I had also Top Speed Pro Headers (definitive improvement of the exhaust flow - you could feel when you are taking off, that the car rolls off easier ) installed before getting the muffler - maybe if I had stock headers, the boom/vibration wouldn't be that much of the problem. Nevertheless I put back my stock muffler, back to normal...
Expensive experiment.
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ZERO engineering. You learned. Hopefully others will listen and learn. I spent 3 years working at one of the top exhaust manufacturing companies in the world (for Porsche) Took us nearly 2 years to lose the drone.
There is NO free lunch.
B