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I would do the C&L intake manifold the same time doing cams. It would seem that a more aggressive cam would benefit from better air flow and be a complementary mod.
I really hope more people try them out. The 2 people who saw no gains may have gotten ahold of prototypes that were supposed to be used for testing because C&L is claiming they still haven't released a final version yet (last I heard). The one featured in MM&FF apparently had a larger plenum I believe? than what those 2 got ahold of. If more people get it and see some good gains on cams+manifold I might consider it. LT headers people claim anywhere from 10rwhp-25rwhp.. I see around 20 being about average but it depends on which ones you get and who tunes it. I think this intake will be the same deal, once they come out with the final version. and depending on what mods you have.