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RENNtech ECU Upgrade 135i E82 (2008-2010 Manual & Steptronic N54B30)

RENNtech ECU Upgrade 135i E82 (2008-2010 Manual & Steptronic N54B30). Up to 420 HP + 435 TQ.
Gains: +120 HP / +135 LB-FT
SKU: ECUBMW:54.E82.135iN54
Retail price without tax: $1,495.00

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.


Stock Peformance 135i E82 (2008-2010 Manual & Steptronic N54B30):

  • 300 HP @ 5800 RPM / 300 TQ @ 1400 RPM


Modified Performance:

  • 420 HP @ 5700 RPM / 435 TQ @ 4300 RPM



  • +120 HP / +135 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: