BMW’s M division has long been associated with high-performance cars that deliver exceptional power, handling, and everyday usability. The M4 Convertible, in particular, blends open-top driving with sports car dynamics. But for German tuning house G-Power, even the stock M4’s performance is just the beginning.
With its latest build, the G4M Bi-Turbo Convertible, G-Power has created a 700-horsepower drop-top missile that can go toe-to-toe with exotic supercars costing several times more. While Ferraris and McLarens dominate the 200-mph convertible club, this tuned BMW makes a strong case for being the ultimate performance bargain.
The BMW M4 Convertible: The Starting Point
The base BMW M4 Convertible is no slouch. Powered by a 3.0-liter twin-turbocharged inline-six engine, it produces up to 473 hp in standard form and 503 hp in the Competition trim. This output ensures brisk acceleration and an already thrilling driving experience.
However, tuners like G-Power see untapped potential in BMW’s engineering. Their expertise lies in pushing the limits of what the S58 engine can deliver while keeping drivability intact.
Summary Table
Specification / Detail |
Information |
|---|---|
Base Car |
BMW M4 Convertible (3.0L twin-turbo inline-six) |
Standard Power |
473 hp (base) / 503 hp (Competition) |
Tuned Version |
G-Power G4M Bi-Turbo Convertible |
Power Output |
700 hp |
Estimated Top Speed |
Over 200 mph |
Key Upgrades |
ECU unlock, GP performance software, carbon intake, stainless steel exhaust |
Appearance Enhancements |
Carbon fiber hood, panels, grille, Hurricane forged wheels |
Price Range for Upgrades |
$4,500 – $42,000 |
Other Brands Tuned by G-Power |
AMG, Porsche, Lamborghini |
Official Website |
G-Power’s Recipe for 700 Horsepower
The transformation into the G4M Bi-Turbo Convertible involves several carefully engineered upgrades.
ECU and Software Enhancements
The first step is an ECU unlock combined with G-Power’s proprietary GP performance software. This allows the engine to run with optimized boost levels and fueling strategies, unlocking hidden performance without compromising reliability.
Intake and Exhaust Upgrades
To complement the software tuning, G-Power adds a carbon fiber intake system for improved airflow and a stainless steel Deeptone exhaust for reduced backpressure and a more aggressive sound profile.
Final Output
The result of these modifications is staggering:
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Power Output: 700 hp
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Top Speed Potential: Estimated over 200 mph (based on G-Power’s previous packages)
For comparison, G-Power’s GP-620 kit delivers 620 hp and is rated for 192 mph, while the GP-700-equipped coupe can reach 205 mph. It’s safe to say the G4M convertible is well within supercar territory.
Performance at Supercar Levels, Without the Supercar Price
Traditionally, if you wanted a convertible capable of exceeding 200 mph, you’d be shopping in the Ferrari, Lamborghini, or McLaren showroom. Those vehicles often start at $250,000 or more.
The G4M, however, delivers equivalent straight-line performance and everyday usability for a fraction of that cost. While the full G4M package runs up to $42,000, it’s built on a platform (the BMW M4 Convertible) that is already far less expensive than a supercar.
A Subtle, Understated Design
Despite its performance credentials, the G4M Bi-Turbo Convertible avoids the loud, aggressive styling cues typical of many tuned cars.
Exterior
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Venturi carbon fiber hood
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Shuriken carbon fiber panels
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Modified grille
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Hurricane forged wheels
The matte paint finish and exposed carbon weave lend it a purposeful, performance-oriented look without being ostentatious.
Interior
Inside, the car remains clean and understated, maintaining the premium luxury feel of BMW’s cabin. Customers can also choose optional upgrades such as a carbon fiber rear wing, different paint schemes, and custom wheel designs.
Pricing and Packages
G-Power offers flexibility with its tuning services, allowing customers to choose from individual upgrades or complete packages.
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Entry-Level GP-600 Software Upgrade: Around $4,500
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High-End G4M Bi-Turbo Package: Up to $42,000
Beyond BMW, G-Power also modifies cars from Mercedes-AMG, Porsche, and Lamborghini, giving enthusiasts a wide range of tuning options.
Frequently Asked Questions
Q1: How fast is the G-Power M4 Convertible?
A. While exact figures aren’t disclosed, it is estimated to exceed 200 mph, based on similar G-Power builds.
Q2: How much does the G4M tuning package cost?
A. The full package costs around $42,000, while lighter upgrades start at $4,500.
Q3: Does G-Power only tune BMWs?
A. No. G-Power also offers performance upgrades for AMG, Porsche, and Lamborghini vehicles.
Q4: Can the G4M be driven daily?
A. Yes. The upgrades focus on enhancing performance without compromising everyday usability.
Q5: Is the tuning reversible?
A. Yes, most ECU and hardware upgrades can be reverted if required, although this may vary by package.
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