January 11, 2017 – Let’s face it, a stock Mercedes-Benz A45 AMG has no chance of beating a BMW M4 in any sort of race, but when you tune the German hatchback to deliver 450 horsepower, things get interesting.

In this video, the tuned A45 AMG faces a BMW M4 that has received an ECU remap, meaning it can produce up to 520 horsepower. The M machine races the A45 using both the standard software (431 hp) and the custom one, so you’ll see what a simple remap can do.

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