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Originally Posted by RYANM330CI
100% Incorrect. All you have to do is trim the rear diffuser.We have customers that install the quad systems all the time on E36,E46 and E39 for about the same price as the dual tip exhaust. Sounds like your installer does not want to wait for the quad exhaust to be in stock.
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I don't think I like the idea to cut out my stock diffuser. I think people can use the Kerscher LH/RH rear bumper with this quad exhaust system, but they have to cut the stock diffuser anyway.
I believe that the Kerscher quad exhaust doesn't require to cut out the stock diffuser at all. The Kerscher quad exhaust is installed below the level of the stock one and the Kerscher LH/RH rear bumper can finish the cosmetic job afterward.