From 173 hp to about 185 hp: the BMW 3 serie 320si 173hp (E90/E91 – 2005 – 2010) becomes noticeably stronger and more responsive with Stage 1 software. Torque climbs from 200 Nm to about 220 Nm.

This is a petrol engine with a displacement of 1,995 cc and engine code N45B20A. The engine is controlled by the Bosch MEV946. The software file can be written with tools such as Alientech KESSv2.

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

Frequently asked questions

How much power and torque does a BMW 3 serie 320si 173hp gain with Stage 1?

About 12 hp and 20 Nm: from 173 hp / 200 Nm to roughly 185 hp / 220 Nm. The exact gain depends on engine condition and fuel quality.

Which ECU does a BMW 3 serie 320si 173hp use?

Bosch MEV946.

Which tools can read a BMW 3 serie 320si 173hp?

Alientech KESSv2.

Which extra options are available for a BMW 3 serie 320si 173hp?

DECAT, DTC Removal, START/STOP OFF, 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.