Looking for tires for a 6R80 TVS car with about 620 rwhp. Currently on AM 19" wheels all around, so I will be buying new rims for the back. The Forgestar F14 drag wheel is a decent match for the existing AM wheels. Im going to try the MT ET Street R tires and need some opinions on the two size choices: 17" rear wheels with the MT ET Street R tire 305/45/17 or 15" rear wheels with the MT ET Street R tire 275/60/15 with sway bar relo the 15" set up is cheaper but the 17" setup could be moved to an S550 someday. Thoughts on if there is much difference in traction?