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Message: [QUOTE="TARM, post: 68446, member: 578"] I bet you will not lose much if any going to the 1.15. If it at all acts the way mine does on my 42. It's very fast. Maybe things like higer elevation have effects but from what little experience I have it seems the 1.15t4 in general is well matched to the 7.3's flow profile across many turbo setups when run as a single. Most of my driving is from 1000'-2000' so I have no expereince with real elevation like out west. But then you are not exactly much above sea level either. I would also think but could be wrong that the perf gained by head work and cam would only add to more exhuast flow making the housing that much more the point of restriction. What about addingv a custom port for an external gate and going with both it and the 1.15? Maybe that might be the best choice over all? Or is that more trouble and cost than you want to deal with. Not to mention 1.15s are not exactly hanging on trees for easy pickins. LOL [/QUOTE]

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