http://is300.net/forum/viewtopic.php?t=13313984&highlight=supra+manifoldIS300GTE said:by the way, it takes much more than a turbo and an exhaust manifold (i'm assuming you are trying to buy someones used kit for 2 grand, and thinking thats all its going to be?) ... anyways as i was saying, it takes a lot more than that to turbocharge a car, especially if you are going "to have some big hp soon" . that implies a decent sized turbo, and even more mods. you won't have jack beyond 340 to 350rwhp unless you pull the head off of the car, AT LEAST, time for you to do some reading son. anyways, to answer your question, the port spacing on the head, and the stud/bolt spacing is different. it would take more work to try and cut and weld and remodify the manifold, then it would to make an entire new one. you probably couldn't even cut and weld the old one without making it a total hack job.