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Message: [QUOTE="KCTurbos, post: 1533926, member: 13852"] There is more than one difference between the stock SD .84ar and the Van 1.15. The turbine wheels are also different. You very well could have fixed a bad turbo, boost leak, exhaust leak, etc... You gate could have been loose and blowing open early which was fixed at the same time. Maybe you even used a different compressor wheel which helped with surging. But I can tell you from doing the tests back to back. Smaller a/r housing will spool faster, and will choke out earlier causing higher ebp/egts on the top end Bigger a/r housings will spool slower, and add flow on the top end. It is a trade off, that is literally how exhaust housings work. [/QUOTE]

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When the truck was new.

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