Do not have supercharger on my H2. However I do have Vortech on my 99 Suburban. It was professionally installed. Got more power. Just can not get rid of the Spark knock, no matter how hot of Gas I put in it.. The vortec did not come with any type of reprograming.. THe only thing I can say is their has to be a reason that Lingefelter(sp) charges $15 grand for the upgrade.. My vortec installed was only $4k and runs like it.. I might suggest doing what I did. when I wnat speed I get in my Honda s2000.. when I want big and cool I get in the h2 or even bigger my Suburban with a 6" lift, roof rack etc etc. Mike
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