MS43 M54B25 Naturally Aspirated Stage 1 Tune




This is a stage 1 naturally aspirated (NA) MS43 tune for e46 325i, e39 525i, z3 2.5i, can be optioned with EWS delete, various levels of burble, and various equipment deletes and optimizations by request. Must use stock injectors and MAF. This tune is not for rwd 04-05 e46 models equipped with ms45.

remote and mail-in tuning options available for this product.

For more information on remote tuning and our process

Flashing directions

Emissions information:

  • Any configuration of a setup that deletes any part of the emissions aparatus will not achieve OBD emissions readiness with our software. And is intended for off-road use only.