Dunno, guys. Reminds me of the guy who was 100% certain his Sig Wonder did 287mph. Had a cop radar it and all. Turned out it was KPH! But he was dead sure he was doing 287mph!
No doubt, the thing is fast, and I have no doubt that MEC broke 300...but this is claiming to be 50mph faster.
I would beleive it if there was a little more regulated and scientific measurement.