The G-Power Legacy and the E63 AMG Bi-Kompressor Conversion

The Mercedes-Benz E63 AMG is already a benchmark in the performance sedan segment, but for those who demand more than factory specifications, the aftermarket offers transformative solutions. Few names carry as much weight in high-performance BMW and Mercedes tuning as G-Power. With decades of experience engineering forced induction systems, G-Power has developed the Bi-Kompressor conversion for the E63 AMG, a dual-supercharger system that elevates the car’s output to a staggering 720 horsepower. This is not merely a power increase; it is a comprehensive reengineering of the engine bay to deliver supercar-level performance while maintaining the daily drivability that makes the E63 AMG so appealing.

The Bi-Kompressor name itself refers to the twin-supercharger setup. Unlike a single large supercharger, which can create significant parasitic loss and heat generation, G-Power uses two smaller, high-efficiency units. These are mounted in a compact configuration, allowing for a clean installation that fits within the stock engine bay without major modifications to the chassis. The result is a system that provides immediate throttle response, linear power delivery, and impressive peak output—characteristics that make the car feel both ferocious and cooperative in the hands of the driver. For an in-depth look at the engineering philosophy behind these systems, the official G-Power website provides detailed technical resources.

Engineering the 720 HP Beast: Components and Calibration

The Heart of the Upgrade: Twin Superchargers

The core of the Bi-Kompressor conversion is, of course, the supercharger assembly. Each unit is a centrifugal-style compressor, belt-driven directly from the engine crankshaft. This mechanical drive ensures that power delivery is instant—there are no laggy spool-up times as with turbochargers. The superchargers are designed to move a significant volume of air, forcing it into the engine’s intake manifolds at higher than atmospheric pressure. On the 6.2-liter V8 (M156 engine) found in most earlier E63 AMG models, this forced induction increases the air density, allowing the engine to burn more fuel and produce more power. G-Power calibrates the boost pressure carefully, typically running between 0.4 and 0.6 bar of boost, which is conservative enough to support reliability while delivering a massive power gain.

Supporting Modifications: Intercoolers, Injectors, and Software

A supercharger system is only as strong as its supporting components. To manage the increased heat generated by compressed air, G-Power includes a high-capacity intercooler system. The air-to-liquid intercoolers are mounted upstream of the throttle bodies, cooling the intake charge before it enters the combustion chambers. Cooler air is denser and reduces the risk of knock, allowing the engine to run more advanced ignition timing for maximum power. Beyond cooling, the fuel system receives attention. Upgraded high-flow fuel injectors and, in some iterations, a higher-pressure fuel pump ensure that the engine receives enough fuel at the increased airflow rates. The final piece of the puzzle is the engine management software. G-Power remaps the ECU to adjust fuel tables, ignition timing, boost control, and throttle response. This recalibration is essential for safe operation at 720 hp, as it ensures the air-fuel mixture remains optimum under all conditions, from cruising to full-throttle acceleration. Notably, G-Power also offers a two-stage power switch, allowing the driver to select between a street-tuned mode (around 600 hp) and the full 720 hp race mode, providing flexibility for daily driving or track use.

Reliability and Longevity Considerations

A common concern with high-power forced induction kits is engine durability. G-Power addresses this by not only adding power but also strengthening critical components. The company often recommends or includes high-performance connecting rods and pistons that can withstand the increased cylinder pressures. Additionally, the oil system is reviewed—the M156 engine has known issues with camshaft adjuster bolts and timing chain wear under high loads, so G-Power’s installation guide emphasizes using high-quality synthetic oil and might include uprated oil coolers. The superchargers themselves are built with robust bearings and internal gearing to provide long service life. While no 720 hp car is as bulletproof as a stock vehicle, a properly maintained G-Power E63 can remain reliable for many thousands of miles. A detailed reliability analysis can be found in independent reviews, such as those from evo Magazine which have tested similar conversions.

Performance Metrics: Beyond the Numbers

Raw Acceleration and Top Speed

The headline figures are impressive: 0-60 mph in approximately 3.4 seconds and a top speed that exceeds 200 mph. But these numbers only tell part of the story. The Bi-Kompressor conversion transforms the mid-range pull. Where the naturally aspirated 6.2-liter V8 feels strong above 4,000 rpm, the supercharged version delivers a relentless wave of torque from as low as 2,500 rpm. The engine pulls hard all the way to its redline, with no drop-off in performance. In-gear acceleration (e.g., 50-100 mph) is dramatically improved, making passing maneuvers effortless and exhilarating. The quarter-mile time for a properly set-up G-Power E63 AMG is around 11.5 seconds at 125 mph, which puts it in the company of dedicated exotics like the Ferrari 458 or Lamborghini Huracan. For official performance data sheets, G-Power maintains a press release archive with specific testing results.

Real-World Driving Experience

Numbers on paper are one thing; the driving experience is another. The Bi-Kompressor car feels urgent and responsive. Because the superchargers are belt-driven, there is zero lag. When you step on the throttle, the boost is immediate. The sound changes too—the characteristic V8 burble is overlaid with a mechanical whine from the superchargers, creating an unmistakable auditory signature. Under hard acceleration, the car seems to hunker down and launch forward with a ferocious urgency that never fails to deliver a rush of adrenaline. However, G-Power has also tuned the car for everyday usability. In traffic, the engine feels composed and docile, with mild throttle inputs resulting in smooth, relaxed progress. The dual-mode ECU allows the driver to tone down the power on wet roads or during city driving, reducing the risk of overwhelming the traction control system. This dual personality is what makes the conversion so well-regarded among owners who want a daily driver with hidden supercar potential.

Comprehensive Upgrade Package: Handling and Safety

Suspension and Chassis Dynamics

Adding 720 hp to a car without addressing its suspension and chassis is a recipe for understeer and instability. G-Power offers a matching suspension upgrade to ensure the car can handle the increased power. The kit includes adjustable coilover dampers that allow the driver to set ride height and damping stiffness to suit both track driving and road comfort. Additionally, upgraded anti-roll bars (sway bars) are fitted to reduce body roll during cornering. These bars are thicker and stiffer than stock, helping to keep the car flat when changing direction. The result is a car that turns in with more precision, maintains better camber control through corners, and inspires higher levels of confidence when accelerating out of turns. The suspension setup is thoroughly tested to work with the stock Mercedes chassis geometry, meaning it does not introduce unwanted handling characteristics like excessive oversteer unless deliberately provoked.

Braking System Enhancements

With great power comes the need for great stopping force. G-Power recommends an upgraded braking system to match the performance gains. The standard E63 AMG brakes are capable, but at sustained high speeds or on a track day, they can fade. The G-Power package often includes larger-diameter ventilated and drilled discs, along with high-performance brake pads that offer higher friction coefficients and better heat management. In many cases, they also upgrade the brake lines to stainless steel braided lines, which reduce expansion under pressure and provide a firmer pedal feel. For the ultimate in stopping power, G-Power offers a ceramic composite brake option, which significantly reduces unsprung weight and improves fade resistance even further. These braking enhancements are critical for maintaining safe, repeatable stopping performance, especially when the car is capable of exceeding 200 mph.

Tire and Wheel Considerations

All that power is useless if it cannot be transmitted to the road. The G-Power E63 AMG requires high-performance tires capable of handling the immense torque. Owners typically fit ultra-high-performance summer tires (e.g., Michelin Pilot Sport 4S or similar) in wider sizes than stock. The rear tires are often 295/30R19 or even 305/30R19 to provide maximum grip from a standing start. G-Power also offers forged alloy wheels that are lighter and stronger than the factory units, reducing rotational mass and improving acceleration. The wheel fitment is optimized to clear the larger brake calipers and discs while maintaining the correct offset for the car’s geometry. Proper tire selection is arguably the most important single factor in real-world performance, as even 720 hp cannot overcome inadequate rubber.

Cost, Availability, and Installation

Understanding the Investment

The G-Power Bi-Kompressor conversion is not an inexpensive undertaking. The kit itself, which includes the superchargers, intercoolers, injectors, ECU software, and necessary hardware, typically starts at around $25,000 to $30,000 USD for the base system. Adding the suspension, brake, and wheel upgrades can push the total to $40,000 or more. Installation by a certified G-Power center is highly recommended and adds another few thousand dollars in labor. Considering that a used E63 AMG can be purchased for $30,000–$50,000, the overall investment for a fully converted car can easily exceed $70,000. However, for enthusiasts who want a bespoke, high-performance machine that offers unique driving characteristics not available from any factory model (including the E63 S or E63 AMG with the Performance Package), the cost can be justified. The car’s rarity and performance capabilities often mean it holds its value better than a stock vehicle, though it will always be a niche product.

Finding a Certified Installer

Given the complexity of the conversion, it is crucial to have the work performed by a professional. G-Power maintains a network of authorized installation centers, primarily in Europe and select locations in the United States and Asia. These centers have trained technicians who understand the specific requirements of the Bi-Kompressor system, and they have access to proprietary diagnostic tools and software. Attempting the conversion at home or with a general mechanic can lead to tuning errors, boost leaks, or mechanical failures. Furthermore, many certified installers offer warranty coverage on the conversion parts and labor, providing peace of mind. Potential buyers should contact G-Power directly to find a recommended installer in their region. A list of authorized distributors and installers can be found on the G-Power website.

Comparison with Other Performance Upgrades

Bi-Kompressor vs. Single Turbo

In the world of high-performance Mercedes tuning, the main competitors to the Bi-Kompressor system are single or twin-turbocharger kits. Turbochargers can produce even higher peak horsepower numbers (some kits exceed 800 hp on the M156 engine), and they typically offer better fuel efficiency under partial load. However, turbochargers introduce lag—the delay between throttle input and boost delivery. A single large turbo, in particular, may not spool effectively until the engine is above 3,500 rpm, making the car feel lazy around town. The Bi-Kompressor system, conversely, provides immediate power from low revs. It also generates a different power curve, with a flatter torque plateau that can be more enjoyable for road driving. Another advantage of the supercharger system is the mechanical reliability—there are no hot exhaust gases flowing through the unit, which reduces thermal stress on the bearings and oil. For those who prioritize drivability and instant response over absolute peak power, the Bi-Kompressor is arguably the better choice.

The E63 AMG in the Tuning Landscape

The E63 AMG (especially the pre-2013 models with the M156 engine) has become a favorite platform for high-horsepower builds because of its robust engine architecture and strong aftermarket support. With a G-Power Bi-Kompressor conversion, the car can hold its own against modern hyper-sedans like the Audi RS7, BMW M5 (F90), or even the Dodge Challenger SRT Hellcat. The combination of four doors, a comfortable interior, and supercar-level performance makes it a unique proposition. While the new E63 S comes with 603 hp from the factory, the G-Power car offers a different kind of exhilaration—the mechanical nature of the supercharger whine and the raw power delivery of the older V8 engine (without complex twin-turbo plumbing) appeals to purists. In the tuning community, the G-Power E63 is often regarded as one of the ultimate expressions of the M156 engine, offering a blend of refinement and brutality that is hard to find elsewhere.

Conclusion

The G-Power E63 AMG Bi-Kompressor conversion is more than a bolt-on upgrade; it is a comprehensive reimagining of what the Mercedes-Benz E63 AMG can be. By boosting power to 720 hp through a meticulously engineered twin-supercharger system, G-Power delivers a driving experience that combines the instant throttle response of a naturally aspirated engine with the raw thrust of a forced-induction powerhouse. The supporting modifications—intercoolers, fuel system, engine software, suspension, brakes, and wheels—all work in concert to create a cohesive, reliable high-performance machine. For the enthusiast who values both power and daily drivability, the Bi-Kompressor conversion represents a pinnacle of automotive tuning. Whether carving through back roads, cruising on the highway, or challenging supercars at the track, this E63 AMG delivers an unmatched blend of luxury, excitement, and sheer performance. The investment is significant, but for those who experience the surge of G-Power’s creation, the rewards are incalculable.