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!

Each tune includes our remote flash tuning and data logging software, up to four hours of remote dyno tuning support, and up to five revisions via data logs over the course of six months. We do NOT support cheating emissions requirements!

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