F.A.S.T. series you run repops of the exact tires your came factory with. These guys use lots of suspension tricks, half wore out tires, and play with tire pressures. One guy has a 69 hemi road runner that runs 9s at 138mph. These cars outwardly appear stock, and are required to run date coded engine part castings where they can be seen. The road runner has a hidden electronic ignition, and the engine is bored and stroked to 528 inches I believe. CNC ported cylinder heads, extrude honed exhaust manifolds and more.