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I purchased the Stebro Racing Exhaust w/ Secondary Cat bypass pipes off E-Bay about 6 months ago. I found the exhaust has a terrible resonance between 2k and 3k RPM. With a hardtop on, the sound is unbearable. W/out the use of ear plugs this muffler made my ears ring. With the soft top up, the 2k-3k RPM drone is barely tolerable. With the top down, the drone is not an issue. Please note, I e-mailed Stebro and they had no solution to "fix" the resonance problem. They also would not switch out the Racing Exhaust with the Sport Exhaust without me paying a $500 upcharge and return shipping. I even offered to accept a used unit. The sound is wonderfull in the other RPM ranges but it was not worth risking hearing damage. I cut my losses and removed the Racing Exhaust in favor of the Stock Exhaust. I'm sure Stebro's Sport Exhaust is fine but I could not understand why a company that makes exhausts for some of the worlds finest automobiles would not make good on something I consider to be a design flaw. They should at least offer a disclaimer on their product or offer a solution to fix the resonance issue. :ah:
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