I've been in my mates standard 300 (you'll meet him at the Mayday meet if your coming) on a top speed run at Hullavington Airfield in Wiltshire. It was in tip top condition, just serviced, all new filters, oils, fluids etc. the speedo hovered between 142-145mph, it wasn't pulling anymore! Now take into consideration I'm a fat git and weigh in at 17 stone, my mate weighs about 9 stone, fuel tank was pretty much empty and also that speedo's over read by 5-10mph your still not hitting that 150mph ever!!