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downpipes dont interchange. 2nd gen turbo's are wastegated and run a larger flange. i've heard that the downpipe for an HX-40 is pretty much universal for updated turbo's on the first gens and some small tweaking for clearances may be need. there's a thread on here that says if your going to put a stock turbo on from a different year they recommended the HX-35- i cant remember what the last digit is. but it's off of the 03ish 5.9L i guess it's decent; but the price jump from that to a REAL good used or new aftermarket isnt bad... maybe an extra 400? someone jump in and correct me if i'm wrong... i guess my advice would be... dont jump the gun. save your money and get something you're going to 100% happy with. by the time you go into the expense of a new model exh. housing and turbo your going to be pretty close to buying a better turbo than the generation swap