Fresh off of introducing its new program for the BMW M6 Cabrio, G-Power is back at it again with a new program for the BMW M4,->ke4183 the car many consider as the headliner of BMW’->ke178s M->ke546 lineup. The program is also applicable to the M3 Sedan,->ke2366 making it a doubly useful kit that can benefit owners of both models.

For this program, G-Power->ke1323 used an in-house developed, Bi-Tronik 2 V2 kit that’s been customized to work on the original control units of the M4 and M3. While it’s a more difficult procedure considering that it involves breaking down the engine’s factory 128-bit encryption, G-Power’s engineers relied on over 30 years of experience in engine development to crack the proverbial wall. Difficult as this process is, it’s also the purest way to achieve all-around performance improvement out of the M4’s 3.0-liter, inline-six engine.

Consider G-Power an authority on such things. The German tuner has a track record of exceptional aftermarket programs for a wide range of Bimmers. The Bi-Tronik 2 V2 kit for the M4 is just the latest example of this.

Judging by the lengths G-Power went to make this kit, it’s safe to say that the resulting power and performance improvements coming out of that inline-sixer is as pure and unfiltered as they’re going to get. That seems about right since you don’t expect anything less out of G-Power.

Continue reading the story after the jump.

Exterior

There are no exterior modifications on the BMW M4, although if you count the new set of wheels, then I guess that counts as an exterior upgrade. For this program, G Power is offering a set of its Hurricane RR forged alloy wheels made from ultra-light, aircraft-grade aluminum wheels and measuring 21 inches. Customers can chose from a variety of colors for the wheels, including Jet Black, Gun Metal Grey, and Stardust Silver. Special colors are also available, but customers will be charged extra if they avail of this particular option.

Interior

The extent of G Power’s interior upgrades for the BMW M4 can be summed in three words: there are none.

Don’t be disappointed because G Power has rarely paid attention to any sort of interior refinements. That’s not to say that the company hasn’t dipped its fingers in that department in the past. But, if you’re looking for priorities from G Power, interior modifications are not what the German tuner considers as “pressing needs.”

Drivetrain

The 3.0-liter inline-six engine powering the BMW M4 is the biggest beneficiary of this new G Power program. Using the aforementioned process in the installation of its Bi-Tronik 2 V2 conversion, G Power managed to raise the M4’s output up to an impressive 560 horsepower at 6,500 rpm and 532 pound-feet of torque at 4,500 rpm. That’s a dramatic increase of 129 ponies and 126 pound-feet of torque from the M4’s standard output.

G Power also installed new downpipes to help cut down the exhaust back pressure. Likewise, the German tuner added an in-house titanium exhaust system with a sound flap in the rear silencer, remote control regulation, and four 3.5-inch tailpipes. Customers can choose between titanium or carbon finish on the finish of the exhaust system. Either way, this exhaust sheds close to 16 pounds of weight on the car.

The loss of weight helps the M4 achieve a sprint time of 0 to 62 mph in just 3.8 seconds to go with a top speed of 192 mph. G Power is also offering a chance for customers to have the M4’s Vmax limiter removed, increasing the top speed to 205 mph.

Price

The price breakdown for this particular program are as follows:

The Bi-Tronik 2 V2 remap costs €2,750 ($2,925). Customers who opt to have the Vmax limiter removed will have to pony up €668 ($710) while the installation of the titanium exhaust system will hit customers in the wallet to the tune of €5,164 ($5,500). Last but not least, is the set of 21-inch Hurricane RR forged wheels. Avail of this fancy new accessory will cost €7,647 ($8,134).

Add all of that up and you're looking at a total cost of €16,229. That's around $17,270 based on current exchange rates.

Competition

BMW M4 Special Edition GTRS4 By Vorsteiner

Vorsteiner’s GTRS4 program for the BMW M4 was launched in December 2014 so this one has a little bit of age compared to the recently announced G Power program.

Here’s where Vorsteiner has the edge over G Power’s new kit. The former comes complete with an aero kit made up of new new fenders add two inches of width per side up front and three-and-a-half inches per side out back. The same fenders also incorporate functional cooling ducts for the brakes, an upgraded front bumper with integrated splitter, aero blade side elements, and a new rear bumper with an integrated rear diffuser. All are made from lightweight carbon fiber and coated in BMW’s factory Austin Yellow Metallic paint.

Vorsteiner also included a new set of custom, three-piece forged wheels, measuring 20 inches. Last but not least, Vorsteiner enlisted the help of ESS Tuning’s E-Tronic ECU retune to boost the output up to 550 horsepower and 560 pound-feet of torque, right smack in the neighborhood of G Power’s own performance upgrade.

Read our full review on the BMW M4 Special Edition GTRS4 By Vorsteiner here.

Conclusion

I’ve always been a fan of G Power so it’s no surprise that I’m high on this new program for the M4. I can’t blame other people for wanting a little more out of the kit, but as far as engine upgrades are concerned, there aren’t a lot of tuners who do it better on BMWs than G Power.

That said, I'm not going to lie. The price tag is a little worrisome, especially for a car that already costs north of $60,000. Add all the costs together and you could be looking at shelling out close to $80,000 on a modified BMW M4. For that price, I'm not sure I can pull the trigger on making that purchase. It's not like 425 ponies on the standard M4 is good for nothing but cheap thrills. Maybe I'll just stick with that since I can still have fun with the M4 in that setup.