[RedChico]

I found out that you can reach a max. speed of Mach 1 (~1100Km/h). Get over it and you'll explode.
Is there a mod to get red of it?

1st, Mach, kilometer wise, speeds are variable with altitude.

2nd, Me 262 HG only does around 1000km/h air speed no matter what the altitude, but true speed will vary with altitude.

3rd, yes you can go above Mach 1 in new slot planes like Mig 15 and F86 Saber, but no, you can't go faster than Mach 1 in IL2 original planes.