While we’re patiently waiting for the M8 to come out, fans of M cars in GT guise have to make due with the M6. The two are actually more similar than you may think at first but they aren’t necessarily rivals for the like of the AMG GT-R which is a proper supercar by all means. That means on the track it will dominate both the M6 and the upcoming M8 as they are more into luxurious cruising fast rather than taking on the twists of a track. But what about in a straight line?

As I already said, the M6 and the upcoming M8 are more similar than you may think right now. As a matter of fact, they share the same core under the hood, the same 4.4-liter twin-turbo V8 S63 engine. However, on the M8 we’re going to see its most powerful iteration so far, some saying that it will deliver over 600 HP in standard guise. The car in the video below also had a bit of work done to it, according to the video description.

Apparently, the M6 went up in the world, from its standard 600 HP (apparently it’s a Competition Package model) going up to a claimed 725 HP at the crank. That’s a noticeable improvement if you ask me and it should also show on the road. Accounting for some 12-15 percent loss on the drivetrain, the car should be putting down at least 616 HP at the wheels. With those figures, the M6 reaches a trap speed of 154 mph which is close to its electronically limited top speed of 155 mph.

On the other side of the strip the Mercedes is not stock either. The 4-liter V8 under the hood was also upgraded and went from the 577 HP it makes on a normal day to approximately 700 at the crank according to the video description. That’s just under 600 HP at the wheels. Considering it’s a noticeably lighter car than the M6, the result of this drag race shouldn’t surprise anyone, the GT-R reaching 157 mph by the end of the run.