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We have a set that uses a smaller T wheel in the S400, with a tighter turbine housing. They will spool a little quicker and are a tad bit better suited for towing/performance. The 400 in the posted kit has a larger t wheel and bigger housing, it provides more air on top end. Egt's should be cooler with this turbo, with a tad less air on the bottom. I would guess to say that this setup would easily support 750 on fuel alone, 700 for the smaller t wheel S400.
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