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Message: [QUOTE="steedspeed, post: 589659, member: 4952"] I have seen excellent results with both the latest manifolds and also the previous ones which had bigger passages. I think for most street trucks it is best to go with 2 inch up pipes to maintain velocity. The dyno Tadd sent me shows boost that is way higher for the whole pull but power seems to hit a wall at top end which is probably the turbo becoming a restriction so a gate would help at that point. I'm sure that some re-tuning to suit the manifolds would also help. Tadd told me that the dyno run with my manifolds was much cleaner with less smoke so obviously they are delivering more air and sooner to burn the fuel as its added so I would expect a pretty good fuel economy improvement. [/QUOTE]

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