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RENNtech ECU Upgrade X5 E70 (2008-2011- N73N2 35d Steptronic Diesel)

RENNtech ECU Upgrade X5 E70 (2008-2011- N73N2 35d Steptronic Diesel). Up to 346 HP + 480 TQ.
Gains: +81 HP & +55 LB-FT
SKU: ECUBMW:54.E70.X5N73
Retail price without tax: $1,200.00

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.


RENNtech ECU Upgrade X5 E70 (2008-2011- N73N2 35d Steptronic Diesel):

  • 265 HP / 425 LB-FT


Modified Performance:

  • 346 HP / 480 LB-FT



  • +81 HP / +55 LB-FT


Contact us

7825 SW Ellipse Way, Stuart, FL 34997
(+1) 561 - 845 7888
Mon - Fri 9am - 6pm


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7825 SW Ellipse Way - Stuart, FL 34997
TEL: 561.845.7888 FAX: 561.845.6777 E-MAIL: