Two turbos, three waste gates and two waste gate controllers-just 1 mistake! Here in part 4 (the finale), I supply complete dyno results of the compound turbo 4.8L LS. It's making boost! I finally got the compound turbo system up and running on the little motor. I combined a little CXRacing 76-mm turbo with a (big) LJMS Borg (Billet Wheel) S480-cuz I had both at the shop! Find out what happened when I left the waste gate controller line off the Turbo Smart waste gate controlling the big turbo! Did it go ballistic?