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Old 06-16-2010, 10:13 AM   #11
BMW Tuner
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Join Date: Mar 2010
Location: Ottawa
Posts: 923
Are you talking 400crank hp or 400- 450whp? because there is a big difference 400 crank= 67hp per cylinder and is not unrealistic figure on stock internals and with a set of ARPs and a good tune you could get there for sure. Now if your talking 400whp-450whp your going to need to upgrade internals, drive shaft, LSD, brakes, fluids, fuel pump ect. takes alot of money to get to a reliable 450whp !!
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