it's because they got it in at the last minute and didn't follow MBRP's jetting requirements.......they did there own thing. i only know cuz i have a full system and i modded that and it has more rev than my yoshi slip-on ever thought of having.HPFman,
I did think about the mbrp.
according to dumbwheels, I mean Dirtwheels the mbrp did'nt give much gains.[/b]