I just bought a hallman pro rx, and i really wanted to know the difference b\t a pro and a rx, because i think i got the pro when i was looking for the pro rx not sure if there was a big difference or even if there the same thing, i bought it off of ebay in new cond. so i was just wondering, the installation says its a hallman pro and thats it. thanks

 

http://www.hallmanboostcontroller.com/