I posted a few 2500hd threads here about headers, exhaust and a few other things. I added small amounts of my supercharger in it but never did it in detail. Some may have seen some of it. Here is it in more full detail. The truck is an 03 2500hd with a 6.0/4l80e, here are the parts that were installed and pics to go with all of it. I will say BLACKBEAR PERFORMANCE has been great with tuning with the auto cal. First a tvs-1900 was bolted on, stock form 5 psi i wasn't really impressed. So the search for more(imagine that)started. A set of stainless works headers with 3 inch dual exhaust was put on. Then the cam swap. Here are a list of the parts for that: Camotion cam Btr double valve springs/retainers/locks comp trunion Gm oil pump Gm timing set ls9 mls head gaskets ls7 lifters Btr 7.4 push rods Gm water pump Taylor 10mm wires 90mm gto ls2 throttle body Arp head bolt kit Alky control meth injection Innovative 8 rib pulleys Walbro 450 intank pump Arp crank/header bolts Ngk tr6 plugs Aeromotive boost ref regulator Stock regulator block off Aeromotive 40 micron filter Torque rush throttle body harness Gates 8 rib fleet green belt Autometer fuel pressure sender and gauge Autometer Boost gauge Aem afr gauge Autometer 3 gauge pillar pod 8 rib rip cut 2.7 blower pulley Upr aluminum catch can Probably more i have missed, alot has been involved.