Again.. I will ask what is your back pressure...
we still dont know crap yet.. if you can say
what your REAL back pressure is we would have
a clue to what the flow of the system is.. everyone
wants to throw out HP numbers but if system X is
this much back pressure and system Y is this much
it will say A LOT.. I measure mine so I do have a
clue to what it is.. a simple gauge hook up will
tell you
EDIT
And state at what RPM