Alpina modified the engine by adding two smaller variable-geometry turbochargers in place of the standard single turbocharger, NGK spark plugs, electronically controlled bypass valve system, a high-performance fuel pump, a 40 percent larger intercooler, Alpina specific ECU along with a wiring loom and a forged high-strength steel crankshaft.

These modifications allow the engine to generate 410 PS (302 kW; 404 hp) with RON 98 fuel and 600 N⋅m (443 lb⋅ft) of torque at 3,000 rpm.

The exhaust system has an electronically controlled valve that remains closed up to 2,500 rpm for more quiet city driving in comfort mode.

[2] The suspension system is mostly based on the donor car but features adjustable dampers and Eibach springs which are 45 percent stiffer.

The car also includes Alpina tuned Sports steering and an optional limited slip differential.

The interior includes Alpina specific sports seats and BMW iDrive infotainment system as standard equipment with USB and Bluetooth connectivity.

A Harman Kardon sound system, an in-car TV and a head-up display are optional.

The engine has received the same modification as the B3, those being a larger intercooler, Alpina specific ECU and wiring loom and a high-strength steel crankshaft.

The bushings and anti-rollbars are Alpina specific and the car's front sub-frame and strut-brace have been modified to accommodate the engine.