RENNtech ECU Upgrade for BMW X5M / X6M E70/E71 (2008- xDrive Steptronic w/ S63B44 V8 Biturbo M)




The RENNtech ECU upgrade is the ultimate tune for the BMW X5/X6M! Our tune allows the SUV to run an astonishing 11.99 @ 114.05 mph in the quarter mile. Our ECU also alows the SUV to accelerate from 0-60 mph in 3.75 seconds and 0-100 mph in a mere 9.2 seconds!

Our proprietary BMW ECU upgrade offers rock solid performance from RENNtech, the foremost tuning authority on Bosch and Siemens engine control units.

These same units are utilized in Mercedes Benz vehicles, which RENNtech has been tuning since electronic engine management started to show up in vehicles during the mid 1980’s, though our proprietary tuning software and approach for BMW is completely unique and independent from our Mercedes tuning program.

RENNtech tuning software for BMW offers significant gains in performance and throttle response without sacrificing your daily driver BMW’s reliability.

By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the top speed limiter, improving engine cooling and modifying boost mapping for turbo charged vehicles; RENNtech performance software unleashes your BMW’s true potential.


Stock Performance BMW X5/X6M (E70/E71 S63B44 V8 Biturbo M)

555 HP @ 6500 RPM / 500 TQ @ 3600 RPM

Modified Performance:

625 HP @ 6500 RPM / 600 TQ @ 3600 RPM


+70 HP / +100 LB-FT

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