shakey at high speeds
#2
Racer
Convert, roof on, roof off? Anyway, First place I would start is to check all the suspension components front and rear. I was going to say tire balance but that won't kill you. Bad suspension parts can.
#3
Le Mans Master
Check to see that all front air dam pieces are in place and in good shape.
Mine would "float" at 100+ when I was missing part of the air dam
Mine would "float" at 100+ when I was missing part of the air dam