Give me a call (610-375-6180 ask for Shane) I work at Penske Racing Shocks. Nothing we build comes off "the shelf". Everything is custom built for your application. Our double adjustable shock goes for $550 per shock. Once you have the shocks its not like we are done with you. You can call in at anytime and we can also look at your racepak data to help you tune the car. I as well am a drag race so I know the importance of shocks and can help relate.