Can I swap a JDM engine into a US-market car?

JDM engine swaps are common and generally legal for off-road or track vehicles, but street legality depends on your state. California requires the donor engine to be from a vehicle of the same year or newer and to pass a BAR referee inspection. Most other states are more lenient. Popular swaps include SR20DET into S13/S14, RB26 into S13 or AE86, and 1JZ or 2JZ into various Chasers and Marks. Engine swap shops specializing in JDM swaps can handle compliance documentation.