yes there are mods for the miller,
the first you start off with a set on under drive pulley, both on the crank and the blower
then you will need a BOV the boost will raise from 9psi to 11psi depending on what puller you get
unorthodox is the best or there is extreme racing.com
they will lead you to a nice mazda parts location site.
with this you should be in the 218hp range bacause i think the stock mellinia s comes with
210bhp,or something like that.
tyr it ad keep me posted, i have a supplier that may be able to help me out if you really needs one
you may contact me if you are serious,
dr.phill@philsmail.com
phill.