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Message: [QUOTE="Powerstroke Cowboy, post: 878382, member: 610"] I would say a S475 would be to small for 250/200 in a compound setup. As a single yes and the atmo in a compound setup no. You will never have the turbo up to full song. In the compound setup you will only want to see 20 to 25 psi out of it verses 40 to 50 in a single setup. (unless you wanted to run crazy amounts of boost) In order to get it to full song you will see boost in the 70+ PSi range. And then all you are doing is making more heat. Now if you had the air to back up the boost that would be one thing. With 250/200 I would recommend at least a 82mm Billet comp wheel, If not billet I would say 86 or 88mm. You have to remember you will only see maybe 20 to 25 psi from the atmo charger. That is why you need the bigger turbo. Besides a good rule of thumb is you want the atmo to flow twice as much air as the high pressure turbo. Other whys all you are doing is shooting yourself in the foot. The S362 flows about 74 LB/MIN The S475 Flows about 105 LB/MIN And the Billet S482 flows about 130 LB/MIN That is the reason would shoot for closer to a 88mm if you go cast or 82 if you go billet, The S475 works good for 5.9 cummins but just is not enough air for the 7.3 . [/QUOTE]

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