I called Golden West Performance in Denver, 303-346-5232. They make the kit for 4.7 using ATI blowers. He didn't have a dyno sheet for 4.7, but stated that their "street kit" 6-8 psi should be good for 75-90 rwhp. also make a 8-10 psi kit and a 12-14 psi kit
They have not run a dyno test on a 4.7 with headers
375rwhp with headers was for a 5.9 with 12 psi, not recommended for engines that haven't had proper internal mods.
It sounds like the intercooled ATI SC is probably more power than my Kenne-Bell, but I'm real happy with what I got.
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