(the below story is fiction)
Was racing a single-turbo Supra about 5 years ago. He was making "well more than 650 rwhp....", and was bragging that he had never been beat on the freeway, car or bike. So I stepped up.
Later, he's rolling next to me about 70. I give him the nod, he goes, can hear his turbo spool up. He's ahead and I nail it (I'm in 2nd). I went by him (didn't slaughter him, just slowly mph past him). A moment goes by, and we're at LUDICROUS speed. I get off the gas, then look in my rearview mirror (he's about 7-8 cars back), *then* look at my speedo gauge. The needle was rushing towards 170, then past, and continued falling. So I assume the needle was around 185+ right when I got off of it.
Had stock gearing at the time, and with bikes not being very exact at all on the speedo's, I assume I was doing an honest 170.
The Supra guy was cool. He kinda knew that if there was any bike that was going to get him, mine would be it. He lost the race, and promplty paid up his losing fee: A double-double cheeseburger, coke, & fries at In-N-Out.