Well the speedart pana turo was with 50 secs pretty Slow up to 300kmh...

but Heat development seems to be a factor from standstill up to 300 km/h... Different story if you Start at 100 km/h for High Speed Runs. ( many 0-300 Times are calculated 0-100+ 100-300kmh=

by the way had a chat with Kelleneres the quote for there 660 hp step 1 m5 28 secs up to 300 km/h. Modified by ECU and exhaust..