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Message: [QUOTE="JonathanN, post: 877362, member: 4486"] Hey, guys... been doing alot of research up to this point so I'm pretty clear on how it works. What I'm a bit more at a loss for is what would make a good atmosphere. I've got a vague idea of what I'm supposed to look at in the maps, but still not sure how to utilize them completely. I turn wrenches for a living so I have no doubt that I could understand it... unless I either don't have the information I need or I can't afford the tools to do the job (alignments and tire work lol LOL ), I do it myself. What I'm building is a 500HP daily driver and tow rig. I know most guys who build compounds are looking for high-hp numbers and while that would be fun, my truck has to stay reliable. I am going to be running AC-codes with 100% nozzles for injectors. My reason for this is because AC-codes are brand new NEVER-been-touched injectors and are very consistent and reliable. My reason for the nozzles is because they can empty an AC in that 2.5-3ms window, or so I've been told by injector builders. I would think that this injector should be capable of putting me at 500HP since an S366 alone can get these trucks up in the 475HP area with these injectors. I might be wrong, but I know I've seen a few OBS trucks with this setup that supposedly dynoed 475HP. Which brings me to what I'm planning for my high-pressure, a waste-gated S366... as for the wastegate size, I'm not sure. I wouldn't think I'd need to run as large as some think. I've heard guys running one close in size to what the area of the two up-pipes is, but being that 100% of my back pressure will never have to be bypassed, I don't see why any larger than a 44mm like Irate uses should be necessary. That's just me, tell why I might be wrong. But for my atmosphere, I'm not sure... I'm not versed enough to know how to pick a good atmosphere using math and maps. I've been under the impression that in general I need to pick something that would make a good single turbo where top-end is desired, maybe a little larger? I know alot of the guys that are running much larger injectors are using 45R and bigger turbos in their compound setups. I'm thinking along the lines of an S475/GT4202? An S475 running a 77mm turbine wheel with the 1.10 T6 housing (the GT4202 is virtually the same)... I can get transition flanges that transition 3-3.5" tubing to a T6 flange, perfect for going from the outlet of the S366's outlet to the inlet of the s475 and should flow really nice. If I go a little smaller, I might do an S471/GT4294 (T6 as well). Truck will also have the appropriate supporting mods: twin oil, studs, valve springs, etc. I understand that this is alot of work and money for a mild build, but I'd love to build a really efficient, cool-running, virtually smokeless truck. I've done alot with the new 6.4's and am pretty hooked and I'd love to see my old 7.3l do the same. The old girl has been good to me and I'd love to see her go another 350K. What do you guys think? Am I on the right track? Is there any more light some of you could shed on the subject? I appreciate it, guys! [/QUOTE]