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Comes down to this... Car under warranty and never want to see a light on the dash? Then it is Dinan. Stage 5 flash with all the other goodies will yield 587 foot lbs of torque on paper at least. Dinan will not make your car the absolute fastest, but you will have more power than a stock M5 and the car will always be reliable and not throw codes.
Cheaper route and not worried about resetting Check engine lights sometimes would be the BMS stage 2 piggy back, go with M5 exhaust or Dinan mufflers, Badblack intake or Dinan intake (Dinan uses forced air induction in conjunction with stock intake) and then the only people who make larger intercoolers for the N63 is Dinan. Shop ebay and the forums and you can get the Dinan part much cheaper than retail. Keep in mind, intercooler and intake from Dinan took me 40 hours of labor to install.
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