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Exhaust sounds great, F1-like. It gets louder with the X-pipe. It drones a little between 2K-2.5K RPM. Can only trust AA re: HP gains, but their designs work.
Their software, not as much.
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M850i Vert with RaceChip
E46 M3, Euro Headers, Rasp Pipe, Kassel Tune
Alpina B8, zero performance mods
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