This is the Taterbuilt 63/67 he351cw direct bolt on upgrade for the 03-07 cummins. This charger will support up to 700RWHP while spooling almost identical to stock. This turbo works great on trucks with stock injectors and just intake exhaust and a tuner and trucks with injectors UP TO 100hp over stock injectors. This turbo will drop your EGT's 200-400 degrees depending on setup and driving style and habits. This charger gets their 63.5mm billet compressor wheel and then paired with their custom 67mm 10blade turbine wheel. 360 thrust bearing, upgraded bearings and total seal seals inside them and they are balanced to .01 or less imbalance. wastegate is set to run 38-42psi. Head studs are not needed but are always a bonus for good insurance on your head gasket if you are running larger injectors. This turbo comes with a 1 year warranty from purchase and the core MUST BE RETURNED with in 45 days to avoid the core charge. You do not need a tune change to run it. Comes with install gaskets and a 1 year warranty from purchase