Dinan E9x M3 Racing Middle Exhaust Software raises the factory rev-limit from 8400 to 8600 RPM*, endowing the V8 with a broader power band and greater road speed potential in each gear. The software also removes the top speed governor, enabling the cars to attain their ''natural'' top speed; and the V8 will pull right to red-line in top gear! Changes to the throttle mapping help soften throttle tip-in for a sportier feel and improved modulation capabilities. The combination of Dinan's re-calibration of ignition timing, fuel delivery, and cam timing produce a maximum gain of 9 hp @ 6000 rpm and 8 lb-ft @ 6000 RPM. Peak horsepower is increased from 414 to 421 at 7900 RPM. This software is for use only with the Dinan racing middle exhaust and will never be emissions legal or for use on a public roads. Rev-limit raised from 8400 to 8600 rpm in manual mode only for cars equipped the M Double Clutch Transmission. The rev-limit is unchanged at 8400 rpm for M-DCT in automatic mode.