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I like Uwons reply. In the beginning I had problems keeping it under 4,500rpm. But the police did not have the same theory as I did, so now I drive slower. lol.
It’s kind of noise sound at this rpm so I added sound proof material under the speakers and at the sides in the back of car, the sound is traveling true there. It’s better now but not great. I’m going to take out the engine in a few weeks for changing one hydraulic cam lifter, and then I’m going to add a lite bit undercoating with a spray bottle. I’m going to spray a lite bit in the wheelhouses to.
I’m going to make a decibel test and see how much I can lower it.
I do have the original exhaust system for sale to my Porsche 996 Turbo Coupe year 2002- about 35K.
I’m driving with a tuning system.
Good luck.
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