Any turbo equipped with a TO4E cover (meaning if you see the letter "E" in the part number) will require a specific actuator that has the correct backing plate bracket welded to it. The stock wastegate actuator, will not bolt up to a GT6131E or PT6131E. On the non ball bearing 6131e turbo, the factory heat shield will bolt up perfectly without any modifications. The only two series of turbos that the heat shield will not fit on, without modifications, are the GT3255E and any of the dual ball bearing turbos. On the dual ball bearing turbos, if you run the oil filtration kit that comes with the braided -4 AN oil feed line, the only modification needed will be to trim the back side of the heat shield so that the water coolant lines can be routed properly. IE: Trim the portion of the shield where the two back bolts bolt the shield to the bracket. If not, and you run the replacement oil feed line from PTE, you will have to seriously cut your heat shield to clear the oil feed line at the top of the turbo.
HTH
Patrick