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I have a friend with ARH headers on his E90 M3. He has custom x-pipe and muffler bypass valves. With the valves closed, it sounds almost as quiet as stock.
But with the valves open, I swear it sounds like a Lambo V10. I kid you not, it sounds that amazing. He also has Schrick cams and E85 flex fuel, not sure if that changes the sound much.
After hearing his car I'm saving up for ARH. I don't even care if it makes zero power. I want that sound!
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