Upgrade stages ranging up to 455 Hp for the 4.2 FSi engine of Audi RS4.

Stage 1 & 2 upgrades, are presented below.

Stock engine specs:
Capacity: 4163cc
bore x stroke: 84.5 x 92.8 (mm)
Compression ratio: 11:1

Power: 420hp
Torque: 430Nm

Stage 1:

Engine upgrades:

-Stage 1 Software upgrade

Engine performance:

Power: 440hp
Torque: 450Nm

Stage 2:

Engine upgrades:

-Free flow air intake system
-Full 70mm exhaust with free flow catalytic converter
-Stage 2 Software upgrade

Engine performance:

Power: 455hp
Torque: 470Nm

Software upgrades:

Use of 95/100 octane fuel is mandatory.