So let me get this straight. You are claiming you have made 475 Whp on a 2871r? Even with Turbo P/N 743347-2 which is the biggest 2871r available, Compressor specs 53.1mm Ind wheel/71.0mm Exd wheel/56 trim/.60 AR, Turbine Specs Wheel dia. 53.8/76 trim/ .86 AR w/internal wastegate, and S trim Compressor housing (thats the 4" .50 AR) Garrett says is only good for 475 CRANK horsepower. So are you running 12.5:1 compression pistons? Alcohol? Something else exotic that we are unaware of?