The D4 BiTurbo is based on the BMW 430d with a modified version of the BMW 435d engine. The D4 BiTurbo replaces the convertible and coupe versions of the D3 BiTurbo.

In line with the new naming conventions at BMW, from the F30-series onwards the Cabrio and Coupe versions of the D3 BiTurbo are named D4 BiTurbo.

In September 2014, the D4 BiTurbo was introduced, unusually not at a motorshow but with a simple pressrelease. At the same time, the Cabrio version of the D4 BiTurbo was announced. This is the first diesel convertible model available from Alpina.

The LCI facelift of the D4 BiTurbo was introduced in early 2017.

Production of the D4 BiTurbo ended in summer 2018 due to EU emission regulations.

The engine is the same as the D5 BiTurbo. It is based on the BMW engine from the 435d, which retains stock engine block and internal parts. It has been modified to 350hp and 700Nm. Heat management is improved by installing the cooling package from the hot-climate version of the 330d, as well as extensive custom Alpina air ducting.

The stainless steel exhaust system was developed together with Akrapovič. It features exhaust system sound control with Drive Performance Control.

The only available gearbox is the 8-speed Sport-Automatic transmission (ZF 8HP70) with Switchtronic.

Optionally, a Drexler limited slip differential is available.

The D4 BiTurbo has adaptive M sport suspension with electronically adjustable dampers, performance springs, bump stops and stabilisers. The suspension is modified with Alpina settings.

Wheels are 19-inch Alpina Classic wheels with 245/35 and 265/35 Michelin Pilot Super Sport tires. Optionally, 20-inch Alpina Classic wheels with 245/30 and 265/30 tires are available, as well as 19-inch winter wheels with 245/35 Michelin Alpin tires.

The suspension features a strut brace and adjustments to camber, toe-in and elastokinematics.

Brakes disks are 370x30mm front and 345x24mm rear with blue aluminum calipers (4-piston front, 2-piston rear) with Alpina lettering.

The D4 BiTurbo undergoes the same interior changes as usual with Alpina. Cluster gauges are custom Alpina with classic blue background combined with steering wheel trimmed in Lavalina leather. Additionally, interior trim is fine Alpina wood or piano lacquer with Alpina logos. A no-cost option are Alpina badges in the seats. Optionally, a custom interior in Lavalina leather can be ordered, as well as additional instruments mounted in the center airduct.

For the exterior, the changes are limited to a frontspoiler, rear spoiler and Alpina badges on the rear. A non-cost option is the classic Alpina decor on sides of the car and frontspoiler. Available exterior colors include Alpina Blue and Alpina Green II.

Acceleration from 0-100kph is 4,6 seconds.

Topspeed is 275kph for the convertible and 278kph for the coupe version.