A Audi A8 4.2i 335hp (D3 – 2003 – 2010) makes about 355 hp and 450 Nm with Stage 1 software, compared with 335 hp and 430 Nm from the factory. That is 20 hp and 20 Nm extra.

This is a petrol engine with a displacement of 4,172 cc and engine code BFM. The engine is controlled by the Bosch ME7.1.1. The software file can be written with tools such as Alientech KESS3, Alientech KESSv2 and CMD CMDFlash.

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

Frequently asked questions

How much power and torque does a Audi A8 4.2i 335hp gain with Stage 1?

About 20 hp and 20 Nm: from 335 hp / 430 Nm to roughly 355 hp / 450 Nm. The exact gain depends on engine condition and fuel quality.

Which ECU does a Audi A8 4.2i 335hp use?

Bosch ME7.1.1.

Which tools can read a Audi A8 4.2i 335hp?

Alientech KESS3, Alientech KESSv2 and CMD CMDFlash.

Which extra options are available for a Audi A8 4.2i 335hp?

Anti lag, 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.