Well I own a 81 300SD with an 84 300D motor in it. In 84 they used the air research and in 81 I think they used kkk turbos. I do have ONE problem which I CANNOT fix. I think the turbo sits a tad tad tad higher therefore causing my exhaust to bump the under body when I hit bumps. Sometimes it decides to go into chronic episodes (when it rains which is weird) and continually rubs on it, which is LOUD. Ive tried installing more brakcets etc etc but it looks like I really have to modify something to fix it. Just a warning

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1981 300SD 512k OM603