As-is, the BMW M4 Competition is no slouch ... CarBahn offers several levels of tuning to increase that output with additional boost pressure combined with a streamlined intake.

With 735 horsepower and a Dinan-tuned suspension, the CarBahn BMW M4 is a precision-guided sledgehammer. Okay, so what the hell is a CarBahn? And what does it have to do with this $135,000, ...

"I am proud to have played my part in the fine-tuning," said Spengler. "The chassis of the BMW M4 Coupé is very sporty. The feedback from the front axle is extremely direct, and the grip on the ...

What if we told you Steve Dinan's latest BMW is (almost) a Porsche GT3 RS (minus the aero) for half the cash? Yeah, that’s right, real drivers will want one. CarBahn calls its G82 M4 mods its ...

Tuning of the adaptive dampers ... Is the restomod world getting out… The updated BMW M4 Competition xDrive packs a 523bhp punch and a broad spread of abilities, but does it thrill like a ...

In the middle sits the BMW M4 CS, or Club Sport ... but Frank van Meel and his team at BMW’s M-division focused on tuning the CS’s chassis to get as much from the Cup 2s as possible.