Hi guys im looking at supercharging my 2012 gmc sierra 5.3l and am looking at several kits. The kits im looking at are Whipple, SLP which uses an eatons , Hennacy and Lingenfelter uses magnuson which is made by eaton. Is there one that is better then the others for performance and reliability as my truck is my daily driver, or are they all about the same. My other question is one company better or worse for warranty and customer service then the others. So to all your peeps that have had this done and to any mechanics or Gm employes that have experience with dealing with these companies or installing one of these kits i would like to hear the good and bad for each.