Ok guys its true,for all of you that ever wondered about doing crazy swaps.They allowed me to test the truck as a diesel.The 1990 toyota 1/2ton was never offered w/diesel in the states,but it was elsewhere.The law states your allowed to import engines from out of country.the only catch is you have to tell them its a toyota diesel.I passed the epas 20% opacity with a 3.4%.Now thats with my modded pump!So as long as it was offered somewhere in the world w/ a diesel your good to go.Im now registered at the epa as a diesel,yah!