Racechip site shows an increase of 59HP/88TQ on a 523HP factory rated M50i. If true these are strong gains for a simple "piggy back" approximate and relatively conservative 3 pound boost increase. An 88 lb torque bump is significant and would be realized each time the gas pedal is pushed to any degree on top of the well over 200 ft lb advantage the M50i has over the 40i.
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