What is the main difference between the Tokico Hi Performance and the Tokico Ilumina 5-way adjustable S & S's? I know the basics, but I am trying to justify spending the difference for my needs. I defintily want them to make a difference as far as drag racing, but seeing as I go about 3-6 times a year, if it isn't gonna make a drastic change then maybe the hi pro's are for me.