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What happens when Steve Dinan, a legend in the BMW tuning world, gets his hands on a BMW M4 Competition? You get the CarBahn BMW M4, which blends breathtaking power with finely tuned performance in a way that feels almost seamless. With 735 horsepower under the hood and suspension enhancements engineered to perfection, this M4 delivers an equally brutal and refined experience.
After selling his namesake brand, CarBahn, Dinan’s latest venture aims to elevate BMWs without straying far from their core essence. Unlike many tuner cars chasing extreme power or flashy modifications, the CarBahn approach centres on balance, precision, and enhancing what BMW already does well. The result is a car that retains its factory feel while performing at an entirely new level.
Dinan’s personal M4 showcases his mastery, featuring a Stage 2 power package for massive gains in horsepower and torque. However, what sets this car apart isn’t just the power—it’s how the suspension upgrades transform the driving experience. With meticulously retuned springs, sway bars, and bump stops, every inch of suspension travel is carefully optimised. The car handles big bumps with remarkable composure and carves through corners with agility that belies its size.
Driving the CarBahn M4 is an immersive experience. Thanks to Michelin Cup 2R tyres and spherical front bushings, the steering feels more precise and confident. The suspension’s interplay between grip and comfort feels natural, making the car adaptable to spirited canyon drives and everyday cruising. It’s not about overwhelming the driver with tech or brute force; instead, it focuses on creating an organic connection between car and driver.
In the CarBahn M4, Dinan proves that his expertise in chassis tuning remains unmatched. It’s a car that captures the heart of what BMW M cars once stood for: performance with character. By working in harmony with BMW’s original design and refining it, CarBahn has created something extraordinary—a car that feels like it’s fulfilling the potential BMW left untapped.
