Buildjournal Tuning Labs releases the all-new B-Spec Tune and it is available for all E46 M3 owners now for $149 (Introductory Price)!

The S54 engine has a lot of potential and with some adjustments to the VANOS, knock sensors, fuel, ignition, etc. we are able to achieve up to 30whp on catless cars. B-Spec Tune will deliver a smooth power band all the way to redline while improving engine performance over stock. We focus on driveability over performance, although you will make power. This tune works for any 2001-2006 BMW E46 M3 including SMG and 6MT transmissions with or without catalytic converters.


Similar to an E-Flash, we will deliver a tuned file, which you can flash to your ECU. However, we will need you to extract the original bin file from your ECU in order to tune, so there are some items you will need to do that. See the B-Spec Tune page for details.