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135i

  • $695.00 Choose Options N54 Stage 1 ECU Performance Software
    ESS N54 Stage 1 ECU software is a result of extensive testing and exact calibration of ECU parameters to allow conservative performance gains on an otherwise stock car. The ESS 335i software is developed and tested in...
  • $795.00 Choose Options N54 Stage 2 ECU Performance Software
    ESS N54 Stage 2 ECU software is a result of extensive testing and exact calibration of ECU parameters to allow significant performance gains on a stock or lightly modified car (intake/exhaust/IC). The Stage 2 software is...
  • $895.00 Choose Options N54 Stage 3 ECU Performance Software
    ESS N54 Stage 3 ECU software is a result of extensive testing and exact calibration of ECU parameters to allow maximum performance gains with a sustained margin of safety. Typical gains are in the 80-90whp range...
  • $995.00 Choose Options N54 Stage 4 ECU Performance Software
    ESS N54 Stage 4 ECU software releases the full maximum for the N54 engine. While others choose to push it farther, we are well aware of the operating limits of the stock turbos based on data from MHI directly. This is a...