Just to answer the question and not to harp on your new ride...
I've done 70 mph in an XP4 900 and wanted more. Stock configuration... it was smooth as hell and rode amazing at that speed in the higher numbered Washes. There wasn't any point where I felt unsafe doing so, just wanted a Sand Car after that.
I will add that I have been in an Allstar car and everyone said the owner was going to make me throw up. He didn't... and I asked him if "this thing can go any faster?". He was not impressed. :lol:
Glad you're enjoying it, that's all that matters.