i have a whole list of aurora racing parts suppliers finally i can get some awesome engine performance like the butterfly throttle system on the IRL, www.kinsler.com they dont list it for sale but they sure made it for the aurora IRL http://www.katechengines.com/ check out the company promotion video theres the aurora V8 IRL. http://www.circleracingonline.com/features/olds_2.html