The tuning stages vary from 380 to 390 hp for the 3.2 engine of BMW M3 CSL.

Stage 1 & Stage 2 upgrades, are presented below.

Stock engine specs:    

Capacity: 3246cc                           
bore x stroke: 87 x 91 (mm)
Compression ratio: 11.5:1

Revlimit: 8200 rpm

Power: 360hp
Torque: 370Nm

Stage 1:

Engine upgrades:

-Stage 1 Software upgrade

Engine performance:

Revlimit: 8200 rpm

Power :380 Hp
Torque : 390 Nm

Stage 2:

Engine upgrades:

-Free flow air intake
-Full 76mm exhaust including Free flow catalytic converter
-Stage 2 Software upgrade

Engine performance:

Revlimit: 8200 rpm

Power :390 Hp
Torque : 400 Nm

Software upgrades:

Use of 95/100 octane fuel is mandatory.