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Message: [QUOTE="Wayne, post: 438611, member: 863"] :whs: Thanks for clearing up what I was trying to say. You and I are on the same page here. I have some datalogged runs of before and after with the non adjusted gate, and the spartan 300 late lock tune. Spool up was definitely slower on the graphs, and I could feel a difference driving, but barely. I'm only speculating here, but like you I assume the larger diameter piping is causing velocity decrease. We have necked the pipes down from 2.5" to 2" directly after the initial 90* bend to help with velocity & flow (this was done on Mike's truck, as well as the kits we've shipped) . Looks like more testing & development will be necessary to maximize the potential in the design. :shrug: My greatest concern is that if they're necked down to 2" outlets, I doubt much gain is possible over the 6.0 manifolds. Time will tell where the future of these manifolds lie. [/QUOTE]

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