Until proof, 200mph is hard to believe, indeed.
However, it is interesting to compare the Lap3 G70 with the Unichip Stinger.
According to Lap3 video, the G70 hits 300km/h (btw, that is 187mph not 190) but is it the end of the video? it is suddenly cut so it could have gone upper few km/h, or not... but who knows?
Now as for power, the Lap3 G70 of the video has 450WHP vs 465+ for the Unichip Stinger I am talking about. And as a matter of fact, until now in all rolling races (done in mexico) the Lap3 pro tuner (released 1-2 months ago here) lost vs Unichip. Lap3 pro tuner is probably a safer/better tune BUT no tune has yet beaten Unichip.
Also, the G70 has HTRAC vs RWD for the Stinger, which means they are the same weight.
Also, the G70 has worst aerodynamics than the Stinger (no numbers to back up this but I have read several times that the drag coefficient of the G70 is higher).
So, ==> if that G70 is able to make it to 300km/h, it does not seem crazy to me that the Stinger is able to go a bit faster. Now, by how much? 200 may be too much of a stretch but I would guess somewhere in between.
PS: The guy that claims 203mph is not my friend so I have absolutely no interest in proving that he is saying the truth. I am just trying to analyze the facts.