Raced a bolt on port and polised 04 mustang with 3.90s and 12.5 inch nitto drag radials from 40 to 120 dead even .then we tried a couple digs the mustang was lanching at 2000 no spin at all and quik pulls 2 cars i spin all the way through 1 then hooks im about half a link back by 80.My ques. is i need major traction for the street. i would go drag radials but no one makes the size i need .Any suggestions? cal tracs, replace gas tank with fuel cell over the axle,. i know the air pressure has alot to do with it and i was runnig 40 psi which is stupid high no im at 18 psi but still only slab 3/4 throttle and just blows the tire until second.