The BMW Z4 is one of the best handling cars the Bavarians are making today. It’s light, rear-wheel drive only and has great balance, all great attributes for a sports car. Some, however, are saying some more power could be useful, especially for the European model. I don’t agree but the guys from G-Power do, so they created an upgraded version of the Z4 M40i, with 500 HP and up to 700 Nm (516 lb-ft) of torque.
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BMW enthusiasts who just want more power have four options from G-Power now. The most powerful take on the B58 engine has, as I already mentioned, 500 HP and 700 Nm (516 lb-ft) of torque. In order for those figures to be reached though, you need some hardware changes. The G-Power upgrade comes with a new intake, new exhaust, new turbos and a new intercooler. It is a bit of a stretch but other choices are available as well.
The Stage 1 upgrade, made solely by rewriting the ECU map can get you up to 380 HP and 530 Nm of torque or 410 HP and 580 Nm of torque. Then there’s the Stage 2 upgrade that takes things up to 450 HP and 640 Nm of torque. This one though, requires flow-optimized downpipes, including sports catalytic converters with the matching tuned software. The improvements should be more than noticeable though.
The 500 HP version might be a bit too much though as you need to remember, the Z4 is a RWD-only model. It’s light on its feet so with that kind of power, if kept under control, I can only imagine just how fast it could be. The tuner doesn’t provide any 0-60 mph estimates but claims the car will be capable of reaching 300 km/h (186 mph) which is quite a feat.