Upgrade stages from 540 to 575 Hp for the 4.4T engine found in BMW 650i. 

Stage 1 & Stage 2 upgrades, are presented below.

Stock engine specs:    

Capacity: 4395cc                           
bore x stroke: 89 x 88.3 (mm)
Compression ratio: 10:1
Turbocharger: Garrett MGT22

Power: 449hp
Torque: 650Nm

Stage 1: 

Engine upgrades:

-Stage 1 Software upgrade

Engine performance:

Power: 540hp
Torque: 780Nm

Stage 2:

Engine upgrades:

-Full 76mm exhaust 
-Air filter
-Stage 2 Software upgrade

Engine performance:

Power: 575hp
Torque: 820Nm

Software upgrades:

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

Use of 95/100 octane fuel is mandatory.