Yeah I couldn't believe it. My secret weapon is the best Ford tuner in the midwest, Bob Monks @ STL Mustangs! Although it might be more like 7 PSI now, since we removed the intake tube and put mesh screen directly on the blower. No pulley change though. I'll watch my boost gauge next time I get on it.
Went to a car meet on Sunday, got into a run with a 2006 Gallardo Spyder (NOT on public roads!!) and he just couldn't seem to pull away from me so I'm happy! Can't feel good to have a $200k car and not be able to outrun a 12 year old Mustang.
Later I found out they're just 500 HP or so at the crank, but I still get to say I hung with a Lambo!
EDIT: Tested it tonight, boost never goes past 6 PSI.