From 343 hp to about 365 hp: the BMW M3 M3 343hp (E46 – 1998 – 2005) becomes noticeably stronger and more responsive with Stage 1 software. Torque climbs from 365 Nm to about 390 Nm.

This is a petrol engine with a displacement of 3,246 cc and engine code 326S4. The engine is controlled by the Siemens/Continental MSS52 and Siemens/Continental MSS54. The software file can be written with tools such as Alientech KESS3, Alientech KESSv2, Autotuner, Bitbox, CMD CMDFlash and 5 more.

Besides Stage 1, the following options are available for this vehicle: DECAT, DTC Removal, FLAPS, Pop & Bang Crackle map and Vmax.

Frequently asked questions

How much power and torque does a BMW M3 M3 343hp gain with Stage 1?

About 22 hp and 25 Nm: from 343 hp / 365 Nm to roughly 365 hp / 390 Nm. The exact gain depends on engine condition and fuel quality.

Which ECU does a BMW M3 M3 343hp use?

Siemens/Continental MSS52 and Siemens/Continental MSS54.

Which tools can read a BMW M3 M3 343hp?

Alientech KESS3, Alientech KESSv2, Autotuner, Bitbox, CMD CMDFlash, DFB Technology DFOX, FG Technology EOBD2, Foxflash, Dimsport New Genius and bFlash.

Which extra options are available for a BMW M3 M3 343hp?

DECAT, DTC Removal, FLAPS, Pop & Bang Crackle map and Vmax.

Figures are indicative and vehicle specific. Check the regulations that apply in your country before modifying engine software.