G-Power 635hp BMW M3 GTS

Power hungry German tuner G-Power has had at the ultra special BMW M3 GTS with an SK II “Sporty Drive” supercharger kit – and the results will have Porsche reaching for the smelling salts.

Even as standard the M3 GTS is a lighter, harder, bigger engined version of the regular M3 – complete with plastic windows, half a rollcage, revised suspension and a 450hp 4.4-litre high-revving V8.

The G-Power version takes the work BMW has already done under the bonnet – 10 percent more displacement, stronger block, forged crankshaft, reinforced con rods – and stacks an ASA supercharger on the top.

The result is 635hp and 464lb ft of torque. Which is 135hp and 140lb ft more than before – enough to see the 0-62mph time drop to 4.2 seconds, and make 124mph disappear in 11.9.

As you can see, the install work is just gorgeous – with the obvious gear under the bonnet complimented by the necessary bespoke engine management, and an indulgent all-titanium, lightweight exhaust system.

Top speed of the G-Power BMW M3 GTS is 200.7mph – verified, like all the other performance figures, by German car magazine Sport Auto.

The work will cost you a mere €23,500 (currently around £20,383) – a bargain, assuming you can afford the M3 GTS’ £100,000-plus asking price. Or get one at all, since BMW is only building 150 of them.

G-Power is happy to report that three M3 GTS have already passed through its workshop, however. And if the GTS is unavailable to you, the “Sporty Drive” supercharger kit will also fit the regular M3 – delivering a mere 600hp.

But at 635hp, G-Power claims its M3 GTS conversion is the most powerful in the world. Is anyone going to take that as a challenge? And more importantly, can we have a go?