i'm seeing like 12 tops. thats with a vortech stock pulley setup and a power pipe. i haven't had a need for an intercooler. granted i'm still going to get a snow kit eventually and up the boost/timing.
about your previous snow comment...the biggest thing with methonal injection is the tune. if it wasn't tuned right you won't get the full effect. If you have a problem with Snow in particular, check out anderson ford motorsports Mr. Freeze.