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In Reply to: what is the best combination for intake, exhaust, posted by throttle body, ECU?....Vancouver Bimmer on September 23, 2001 at 20:32:29:
As to software, I'm personally leery. I'm not too high on raising the rev limiter (BMW made it very close to what the bottom end of the motor can actually handle) and I've heard stories ranging from too rich a fuel mixture to the OBD II cars adjusting and eliminating the tuning.
Besides, our cars' computers are pretty well set up as it is. I'm not sure if the few ponies you'd get would be worth the $400-500 bucks. But if I were to go with software, I'd probably pick one of BMW's approved Dinan's programs.