Right from its 2014 debut the BMW M4 found favour with customers, thus continuing the long and successful tradition of the two-door M3 models whose mantle it now carries.
Keen drivers looking for a more focused experience can also specify the factory Competition Package, which provides a healthy 450 hp (331 kW). If that is not enough then owners should beat a path to the door of G-POWER, whose 35 years of experience as a specialist BMW M tuner has helped them unlock the full potential of the M4.
Using their knowledge of the hardware and electronics of the BMW M 3.0-litre TwinPower Turbo straight-six, the G-POWER engineers have extracted an extra 150 hp, making the new headline number a rousing 600 hp (441 kW).
The hardware changes are a bespoke titanium exhaust system featuring new downpipes without catalytic convertors (export only), and a rear silencer box culminating in four 90 mm carbon tailpipes. This system significantly reduces exhaust backpressure and exhaust gas temperatures, allowing the use of higher boost pressure for increased power.
The revised fuel, spark and boost mapping parameters are governed by the G-POWER Bi-Tronik 2 V3 electronic control unit remap, which is calibrated to each individual cars engine for optimum performance.
As this output level is beyond the headroom of the factory turbochargers, G-POWER undertakes extensive modifications, including aerodynamically optimised turbine wheels and flow-optimised CNC-machined turbine and compressor housings. The resulting improvement in overall efficiency delivers 600 hp accompanied by a significant increase in torque from 550 to 740 Nm. The stopwatch says that the G-POWER M4 passes 100 km/h from rest in just 3.7 seconds, while removal of the electronic top speed limiter gives the car a top speed north of 320 km/h.
For owners who do not wish to go the whole hog G-POWER also offer two milder alternatives. The most basic conversion provides an output of 520 hp (382 kW) and 700 Nm from a choice of the Bi-Tronik 2 V1 ECU bespoke remap, or the Bi-Tronik 5 V1 external power module.
The middle conversion for the M4 Competition provides 560 hp (411 kW) and 720 Nm, via either the Bi-Tronik 2 V2 remap or the Bi-Tronik 5 V2 module, plus the exhaust downpipes without catalytic convertors.
Uprating the chassis performance to safely deploy the extra power is the job of the G-POWER GM4-RS coilover suspension. This suspension gives the car a lower, more purposeful stance, and optimises tyre grip.
Low unsprung weight helps acceleration, braking and turning, and the popular HURRICANE RR forged double spoke design wheels provide this desirable characteristic. The M4 uses 9.0 and 10.5×21-inch wheels shod with 255/30ZR21 and 295/25ZR21 tyres.