I check and get back to ya

 

www.Eibach.com
www.tirerack.com has h&r coil over suspension

 

start by upgrading your flywheel with a lighter one to free up rotating mass. then the transmission, polyurithatne bushings everywhere and i highly recomend tubular rear control arms panhard bar and adjustable torque arm to go along with your posi. i got a RS into the 13s with that rear suspension set up. and if your up to it all that other **** like drive shaft and front suspension upgrades.