Currently running 4.56 sure grip in my slant 6 car,which are close to perfect for the 1/4,but my local track is a 1/8th,I would like anouther one so I have both covered,been running 8.30s with the 4.56,in the 1/8th,HOPEING a 5.13 would get me into the 7s,.Can buy new ready to go for about a...