The M850i version of the BMW 8 Series is pretty potent with 523 horsepower on tap. But the M Division has stepped the performance up even further with the release of the M8 and M8 Competition, which produce 600 and 617 hp, respectively. These are the two most powerful 8 Series variants BMW will sell you, but if you are willing to go aftermarket, German tuner Dähler will offer an even more powerful car.

Dähler has recently turned its sights on the Z4 and will now focus its efforts on the flagship 8 Series. Introducing the Dähler Competition Line, the most powerful 8 Series we've seen so far.

Dähler's car is even more powerful than the 8 Series Manhart recently revealed, featuring a power increase level 1 kit, which bumps output to 636 hp and 625 lb-ft of torque. If that's not enough, Dähler says it is working on a power increase level 2 kit, which will offer even greater performance from the 4.4-liter twin-turbocharged V8. Along with the power boost, this level 1 kit increases the top speed from 155 to 187 mph.

You won't just be able to feel the additional power when you mash the throttle, you'll be able to hear it too. That's because Dähler is about to release a stainless steel exhaust system with a rear silencer and quad tailpipes.

Other changes to the car include a lowering spring set, 21-inch CDC1 Counter wheels wrapped in Michelin tires, and a front spoiler. A specially-tuned, adjustable Competition coilover kit will also be available soon, offering adjustment in both height and stiffness. It also looks like Dähler made some minor tweaks to the 8 Series' digital gague cluster, giving it a blue and green theme similar to an Alpina. Dähler hasn't released pricing or 0-60 times for the new car but we assume it will give the M8 Competition a run for its money in a straight line.