2021 G-Power GX5M Bi-Turbo and GP 63 Bi-Turbo - story fullscreen Fullscreen

2021 G-Power GX5M Bi-Turbo and GP 63 Bi-Turbo

G-Power gives both the BMW X5 M Competition and the Mercedes-AMG G63 the same amount of power through a series of crazy upgrades

LISTEN 02:35

Usually when you see a BMW and a Mercedes one next to the other is for some sort of competition. But, German tuner G-Power decided to stop the rivalry and get both the BMW X5 M Competition and Mercedes-AMG G 63 into the shop for some serious upgrades.

What changes were made under the hood?

2021 G-Power GX5M Bi-Turbo and GP 63 Bi-Turbo Exterior
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G-Power is offering an upgrade kit for both the BMW X5 M Competition (GX5M Bi-Turbo) and Mercedes-AMG G 63 (GP 63 Bi-Turbo)

From the factory, the BMW X5 M Competition is offered with a 4.4-liter, twin-turbocharged V-8 engine that delivers a total of 617 horsepower and 553 pound-feet of torque. The Mercedes-AMG G63 on the other hand has a 4.0-liter, biturbo V-8 engine that delivers 577 horsepower and 627 pound-feet of torque.

Impressive numbers for some SUVs, but there is room for improvement for both of them. And apparently, a lot can be improved, as for both SUVs the German tuner is offering three different levels of power upgrade.

2021 G-Power GX5M Bi-Turbo and GP 63 Bi-Turbo Exterior
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Stage 1 includes G-Power’s GP-700 performance software

Stage one includes G-Power’s GP-700 performance software. With this upgrade both models will now deliver 700 horsepower, while torque in the GX5M Bi-Turbo (aka the X5 M Competition) goes up to 626 pound-feet and in the GP 63 Bi-Turbo (aka the AMG G63) it goes up to 700 pound-feet.

In the next stage, the GP-700 performance upgrade is combined with a new sports exhaust system with flap technology.

The result: both SUVs now deliver 750 horsepower and torque goes up to 663 pound-feet in the X5 M and to 737 pound-feet in the G63.
2021 G-Power GX5M Bi-Turbo and GP 63 Bi-Turbo Exterior
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There are three different level of customization, each with more power and toque

The final stage also includes an upgraded turbocharger that enables the delivery of higher boost pressures and significantly increased air masses. As a result, power is now increased to 800 horsepower, while torque is 700 pound-feet in the X5 M and 774 pound-feet in the G63.

Are there any other upgrades?

2021 G-Power GX5M Bi-Turbo and GP 63 Bi-Turbo Exterior
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The package also includes a new set of 23-inch ultra-light and high-strength forged wheels

No, G-Power left the exterior and the interior for both SUVs untouched. The only upgrade is a new set of 23-inch ultra-light and high-strength forged wheels offered for both models.

Alina Moore
Alina Moore
Alina Joined the Topspeed.com team in the early 2000s as one of the outlets very first experts, and she’s been with Topspeed.com ever since. Over the years, she’s served various roles, but today she’s is relied on heavily to verify automotive facts, assist with formatting, and discover new and engaging topics.  Read full bio
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