MSS54 to MSS54HP Conversion

Convert your MSS54 or MSS54HP to full OE CSL spec with this conversion. We add the necessary capacitors and H-Bridge to the boards so that all S54 CSL functionality is retained including the stock OE motorized intake flap if desired. ISNu2019s are reset so EWS needs to be reset or deleted. The full CSL firmware is BDMu2019d directly onto your ECU. This is not a hamstrung cobbled together firmware, this is a genuine CSL full binary. MSS54 NON HP cost $255 to upgrade to genuine HP DMEu2019s.

The CSL firmware is by far the most proper software for anyone looking to install the CSL airbox, install ITB Stack kits, or to delete the MAF.

2001-2003.5 E46 M3s have MSS54 ECU's and will need the HP conversion in order to run CSL software.