i had my car mapped by angel tuning and the technian told me to try puting the standard airbox back on, i had a apexi cone with the 2.2 setup.
after put the standard box back on i did notice a bit of a difference, a everyfing was fine.
the other night i put my cone filter back on but kept the cross over pipe on. now i notice wen i boost there is a hesitation, is it because of the filter????