The tuning stages vary from 105 to 110Hp for the 1.0T engine of Smart ForTwo.

Stage 1 & Stage 2 upgrades, are presented below. 

Stock engine specs:

Capacity: 999cc
bore x stroke: 72 x 81.8 (mm)
Compression ratio: 10:1
Turbocharger: TD 025

Full boost: bar@2000 rpm
Constant pressure:bar
Pressure at revlimit:bar
Revlimit: 6500 rpm

Power: 105hp
Torque: 120Nm

Stage 1:

Engine upgrades:

-Stage 1 Software upgrade

Engine performance:

Full boost: 1.1bar@2000 rpm 
Constant pressure:bar 
Pressure at revlimit:bar 
Revlimit: 6500 rpm

Power: 105hp
Torque: 150Nm

Stage 2:

Engine upgrades:

-Free flow air intake system
-Full 60mm exhaust with free flow catalytic converter
-Stage 2 Software upgrade

Engine performance:

Full boost: 1.4bar@2000 rpm 
Constant pressure:bar 
Pressure at revlimit:bar 
Revlimit: 6500 rpm

Power: 110hp
Torque: 170Nm

Software upgrades:

Boost control is achieved using the OEM ECU and N75 valve.

Use of 95/100 octane fuel is mandatory.