The PhatShaft 62 is the perfect upgrade turbo for towing.�� The PhatShaft 62 for the 12 valve comes with the 12cm housing matched with a 65mm turbine.� We suggest a 12 cm turbine housing if the truck has moderate fueling upgrades such as 300hp injectors and a camplate.� If the truck has heavier fueling upgrades such as 370hp injectors, aggressive camplate and governor springs then you will be better suited with 14cm housing.� The benefit of the 14cm exhaust housing is lower Exhaust Gas Temperatures but it will be slower to spool in daily driving situations.��� The wategate is set at 40psi to prevent head gasket failure.� The PhatShaft 62 compliments moderate fueling upgrades and can support 300 - 550hp. The 62 is a drop in replacement however, a HX40 downpipe is required for instalation