The Northern California–based CarBahn gives the BMW M4 Competition xDrive an aftermarket makeover that builds on an ...

Forged CarBahn wheels are wrapped in sticky Michelin Pilot Sport Cup 2R tires. CarBahn offers a factory-matching warranty and ...

The 2025 M4 CS acts as the “GT3 Touring” of the M4 range in its lineup placement philosophy, combining the juggernaut ...

as well as revised ECU tuning, a better-flowing titanium exhaust system, and a cold-air intake. CarBahn’s CB3 Signature Package turns the BMW M4 Competition xDrive into a carbon-fiber-clad tour ...

Compare that to the rear-wheel drive M4's twin ... like the BMW's B58 doesn't automatically mean it will make more power or even run well enough to enjoy. To that end, ECU tuning is crucial ...