Who doesn’t like dyno tests? Miserable people, that’s who, or perhaps low-down dirty miscreants who have shoved Iron Dukes into their GTOs. The rest of us always enjoy the cold, hard truth that a dyno wrings out of cars, and today we’d like to share this comparison of a 2018 BMW M3 with the Competition Package and a regular 2018 BMW M4.

You may be thinking, wait, wait, isn’t that the same engine in those two cars? That 3.0-liter turbo straight-six? Well, pretty much, but this test shows how much the Competition Package—which for about five grand extra gives you an improved chassis, suspension, steering, lighter seats, a tweaked limited-slip differential and more power—translates into real thrust.

So, according to BMW, the M3 Competition should be making 444 horsepower, up from a base of 425. I’m curious to see how many of those horses get sacrificed on the way to the wheels.

The M4 should make 425 HP; again, it’ll be interesting to see the losses to the wheels here, too. Okay, let’s watch already and see what happens:

Huh. Interesting, right? Here’s the results—and I rounded up if tenths digit was 5 or above, like these guys should have:

M4: 386 HP, 406 lb-ft of torque

M3 comp pass one: 391 HP, 403 lb-ft of torque

M3 comp pass two: 402 HP 414 lb-ft of torque

Then, they tested the M3 with a higher octane fuel, and got a very nice jump in both power and torque: 418 HP and 432 lb-ft. That’s not too bad—under 40 HP of drivetrain loss from engine to wheels for the M3 competition, and about 36 for the M4.

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Really, if these dyno videos tell us anything, it’s a reminder that almost every specified performance number for a car is a really just a representative out of a range, and there’s so many, many factors that can affect things.

I’m not saying MPG and horsepower numbers are a lie, but, you know, they sort of are.