I mean your traction will make or break your ET but spinning tires generally will yield a better trap speed. I mean its not like your spinning ALL the way down the track. I generally spin through first gear on streets and will go 110+mph with a slower ET but with tires i'll go 108mph or something with a much better ET. HP yields speed bottom line and with 117mph max, its hard to believe 500rwhp. With 500+hp you think you would easily bust 120+mph consitantly. Hell i've seen people on 400rwhp pull 118-122mph everytime. Something is weird about these times vs. your dyno or you just flat out can't drive. One of these is the reason IMO.