u can also try crimping one outlet not fully colsed but , maybe start off with half then take it from there until u find a balance that gets u enf tank pressure. the classic sign of not enough pressure is ull find that ull find the high speed needle not sensitive\ rseponsive . ideally u shd figure out at what HS needle setting the motor runs with stock muff(if u have one) then try to replicate that setting with the aftermarket one until she runs fine