Yes I have..I meant psi wise...the triple k sweet spot is 12-15psi correct? then if I have seen 20psi, which is wasted boost correct? The stock rings will handle 20psi or more? I'm limited by the rear end and 4spd but I have the rear end out of the 83 sd, have seen a ratio sheet and it seems the same if I remember....please correct me if I wrong. I have read tons of stuff and work on some of these, but I'm wondering if I make my own intake and exhaust manifold then I can add bigger turbo.. or more fuel hell something i dont know...just so fun to play with...and when it builds boost :fork_off: