I have the Eisnenmann Race on my 535. I absolutely love the loudness of it and think it's at just the right level for an everyday driving car which the driver wishes to have a performance/sport sound. I notice a small amount of drone around 2300 RPM on the highway, as Mercury said you can change gears and eliminate it. I have about 700 miles on the exhaust so it has not fully broken in yet.
I have never regretted my choice at any point and would highly recommend it.
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