News Source: autoblog.com

Ever wonder what it would be like to greet the coming summer season with a high-performance convertible that’s been tuned to be faster and more powerful? Well, those questions could be answered if you own a BMW M4 Convertible  and you’re in the market for an aftermarket tuning program. German tuner G-Power  has all your needs covered with a new tuning kit designed specifically for the M4 Convertible. 

The kit follows the typical style of G-Power. There aren’t that many exterior and interior enhancements, but the lack of mods in these two departments are made up for by an engine modification that puts a significant amount of extra power on the M4’s 3.0-liter turbocharged inline-six cylinder engine. It may sound trivial for some, but for those who appreciate 600 horsepower on the M4, this performance kit should be right up their wheelhouse.

To be fair, G-Power has built programs for the M4 before. But this is the first time that the tuner has taken a stab at the M4 Convertible. The good thing is that G-Power is renowned for being one of the best tuners of BMW  vehicles in the world so if you’re going to have your M4s worked on by an aftermarket company, the German tuner is one of the safest bets to get the job done. If for nothing else, you can always count on a company that has 30 years of experience doing these kinds of modifications.

As expected, there are very little modifications to the M4 Convertible’s exterior. There are no aerodynamic kits and there are no fancy body wraps, although if you want to be technical about it, there are a few blacked-out parts, including the front grille and the taillights. That might be disappointing for some people, but if it’s any consolation, the German tuner is offering a new set of 21-inch Hurricane RR forged alloy wheels as part of the whole program. The wheels measure 21 x 9.0 and 21 x 10.5 in size and are shod in 245/30R21 and 295/25R21 high-performance tires, respectively.

The same holds true in the interior of the M4 Convertible. While it would’ve been nice to get some upgrades on the cabin, it’s hard to fault G-Power for brushing off this section in favor of concentrating its effort on giving the car the performance upgrade it deserves. Besides, it’s not like the M4 Convertible has a mediocre interior. On the contrary, BMW already did most of the legwork by giving the cabin plenty of neat details, including the M specific stitching and badges that help distinguish the M4’s interior from standard 4 Series convertibles. Sports seats and fine leather are also included in the interior styling so this section is already well taken cared.

Suffice to say, G-Power carried out significant modifications on the M4 Convertible’s 3.0-liter turbocharged inline-six engine. At the heart of this modification is the tuner’s Bi-Tronik 2 V1-ECU remap that by itself already increases the output to 520 horsepower and 516 pound-feet of torque. That already represents an increase of 95 ponies and 110 pound-feet of torque.

But G-Power has shown time and again that it’s never content with “slight” upgrades. So it went out and concocted an extensive combination of hardware and software upgrades, beginning with the replacement of the standard compressor wheel with a larger CNC-milled unit. G-Power’s engineers also worked on the exhaust turbine wheel, which helps drop exhaust gas temperature and improves boost pressure. Even the turbocharger’s housing unit was machined to accommodate the new compressor and exhaust turbine wheels. Optimization of the internal gas flow was also carried out, completing the comprehensive upgrades on the whole engine setup.

All these upgrades contributed in increasing the output of the M4 Convertible’s turbocharged inline-six engine to 600 horsepower at 6,500 rpm and 546 pound-feet of torque between 4,000 and 5,500 rpm. The results are eye-popping and no more was that evident than in the car’s improved performance numbers. Yep, this engine modification was enough to allow the sports car to sprint from 0 to 62 mph in just 3.7 seconds, half-a-second quicker than the standard model. Likewise, top speed has been increased to 199 mph, much faster than the M4 Convertible’s electronically limited top speed of 155 mph.

So the extra power and speed are already there. But it’s still not enough to really appreciate the full G-Power experience. The tuner addressed that by installing a bespoke ultra-lightweight titanium exhaust system that delivers the kind of exhaust note you can only get from a tuner like G-Power.