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Message: [QUOTE="Kowboy, post: 1561847, member: 29363"] JSchuricht, At the time I was asking about the S300 turbo I had a ZF5 42 and 3.55's. I was running the D66 turbo, with 160/80 injectors. I started out with the 1.0 turbine housing and then went to a gated .94, and then to a non gated .84. All of these were quite slow to spool. I actually think that the stock turbo spooled better then the D66. I know a guy in Twin Falls ID that had a T4 with an old style 366/.91,. Cody's truck has an auto trans with 4.10's and 160/30 injectors I believe. When I drove his truck It was much more responsive (turbo) and less smoke. Just built boost better then the D66. Cody told me he went through nearly the same route I had. I started looking at the options available for the T4 turbos and decided on moving to T4. My dilemma was what turbo? I contacted a number of vendors and read many posts on the BW SXE turbos. Had many different turbo options suggested. James Barder suggested the 363/68 due to my elevation. I had also asked about the different turbine wheels 68 0r 73, for the 363 he said that the 73 would be slower to spool and a bit of a mismatch. So elevation played a big part of my choice. I have been down near sea level and it is a bit more responsive but still is a great match for my setup. I did contact AGP turbo before ordering the gated .83 housing. I went gated so if I do happen to push it some that I will not overspeed the turbo, and will keep the exhaust back pressure in check. Please read the above post as the gated housing needs some work to fit. There are quite a few folks running the 363 just takes some digging to locate the info. Here is one long post with quite a bit of info. FYI: The 363 will move more air then the 38R [URL unfurl="true"]https://www.ford-trucks.com/forums/1615811-s300-t4-83ar-housing.html[/URL] Hope this helps. [/QUOTE]