With 600 horsepower and 516 lb-ft of torque, you’d think the BMW M6 Convertible fitted with the Competition Package has plenty of Bavarian muscle in stock form. The tuners at G-Power have an entirely different opinion, as they have fiddled with the 4.4-litre V8 engine to squeeze a monstrous 800 hp and an insane 774 lb-ft of torque from it.
These impressive numbers have turned the M6 into one of the fastest convertibles ever made, capable of running the sprint to 124 mph in 9.8 seconds before maxing out at 205 mph once the tuners remove the electronic top speed limiter.
It had to undergo a lot of changes to achieve these output and performance numbers, mind. G-Power’s take on the eight-cylinder BMW engine features both hardware and software revisions. Most of the power bump was achieved by swapping over the two turbochargers with thoroughly upgraded in-house turbines that are bigger and more efficient.
Larger downpipes were necessary to cope with the extra power provided by the V8, while a titanium exhaust system was also installed for further boost. As you can imagine, the engine’s ECU also had to be reprogrammed to match the upgraded internals.
G-Power didn’t stop there, either. It also gave the M6 Convertible a height-adjustable coilover suspension and lighter 21-inch custom wheels matched with performance tyres.
Needless to say, these upgrades don’t come cheap. The special engine mapping costs £3900, while the electronic top speed limiter removal is £575. If you want the upgraded turbochargers, that’ll be an extra £3300. The aforementioned downpipes with sports catalysts cost £3,300 and the titanium exhaust is a pricey £5,700. Rounding off the upgrades are the forged wheels with matching tires for £6500 and the coilover suspension for £2000. Do the sums and you’ll end up paying £25,500. But, 205mph!