BMW Z4 (2003-2005) MS45 ECU Tune - Stage 3

See our full write-up for more details and other tuning options!

Stage 3: Specifically developed ECU tuning for vehicles making over 400 bhp / 350 whp, or engines utilizing a blow-through aftermarket mass airflow (MAF) sensor. Stage 3 includes the same parameter revisions as Stage 2, plus additional modifications to the ECU’s program code to support a high-flow MAF sensor as well as sensor scaling. Stage 3 is recommended for cars with ‘built’ engines, including customers seeking a TS3 setup for MS45. Our Stage 3 ECU tune is the ultimate MS45 tuning solution, developed specially for the most serious customers!

Handheld Flash Tuner: Some customers desire the ability to flash between tunes without taking a laptop with them. Our handheld, touch screen flash tuner ("programmer") stores up to five tunes which can be flashed to the vehicle's ECU in approximately two minutes. Our Stage 1/2/3 and Alpha-N tune purchases include a FlashApp license, so this purchase is NOT required in order to upload tuned files to the ECU and is offered as an additional add-on. 

Additional Tunes: Three additional tunes can be purchased for $500. Examples include normal/high boost, summer/winter, high/low altitude, pump/race gas, E85, OBD2 monitoring on/off.

FIC Fuel Injectors: Severn Tuning recommendations are as follows.

365cc - Naturally aspirated applications on pump gas, flex fuel, or full E85. Forced induction up to 300 whp on pump gas.

650cc - Forced induction engines up to 350 whp on E85 / 450 whp on pump gas

775cc - Forced induction engines up to 420 whp on E85 / 560 whp on pump gas

1000cc - Forced induction engines up to 540 whp on E85 / 720 whp on pump gas