When a Bavarian Meets Bolt-On Performance
Here's what happens when you throw serious money at BMW's already potent M4 Competition: you get a road missile that costs less than half the price of Ford's flagship performance car. While the $325,000 Mustang GTD commands supercar money, the G-Power G4M Bi-Turbo Convertible proves you don't need to break the bank to achieve hypercar performance numbers.
The math is beautifully simple. Start with a $70K BMW M4 Competition, already good for 530 horsepower and 0-60 mph in 3.8 seconds, and add $42,000 worth of carefully chosen modifications from G-Power. Suddenly, you're looking at a 720-horsepower machine capable of 205 mph. Meanwhile, the 815-horsepower Mustang GTD only cracks 202 mph, despite its horsepower advantage.
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Mustang GTD Killer for Half the Price
The performance gap becomes even more striking when you consider the BMW's tunability advantage. The BMW’s twin-turbo 3.0-liter inline-six responds beautifully to modifications, while Ford's supercharged 5.2-liter V8 in the GTD is likely already pushing the safe performance envelope right from the factory. The GTD's claimed 0-60 mph time “under 4 seconds” seems less impressive when a properly modified M4 with all-wheel drive can achieve better times.
Of course, it goes without saying that there’s a fundamental difference in philosophy. Ford engineered the Mustang GTD as a no-compromise track weapon from day one, complete with carbon fiber bodywork, advanced aerodynamics, and suspension tuned specifically for track work. It's an impressive engineering achievement built to topple track records, not win drag strip fights. That said, it does come in at a price point most enthusiasts can only dream about.
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The German Advantage in Aftermarket Potential
The beauty of the M4 platform lies in its potential. While Ford developed the GTD as a limited-production halo car, BMW created an everyday sportscar that responds magnificently to aftermarket enhancement. With tuning company G-Power’s help, the result is an M4 convertible that’s a legitimate supercar competitor. All while being able to drop the top and enjoy that thrilling performance in all its glory.
This isn't just about raw numbers, it’s about accessibility. G-Power offers various packages for the BMW platform, starting with a $4.2K boost up to 600 horsepower. The full build with all the tuning company’s goodies, both aesthetic and performance, work out to the $42K headline figure. Add in a used G83 BMW M4 Convertible for around $70K and you still get a modern sports car with supercar-slaying performance at just a third of the price.
This story was originally reported by Autoblog on Aug 26, 2025, where it first appeared in the News section. Add Autoblog as a Preferred Source by clicking here.
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