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I have a tuned 540i with bolt ons. Intake, Intake elbow, Charge pipe, Catless Down pipe, Dorch Stage 1 HPFP, turbo blanket, 10.5 rear wheels, and Bootmod3 stage 2+ on a Flex Fuel tune, RWD. My car is really fast and fun to drive, but its nothing compared to an AWD m550.
If I upgrade to a Dorch Stage 2 HPFP and swap out a big or hybrid turbo, its a different story, but at that point why not just get the M550.
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