I have a saito 180 that i need the muffler for it, i have the header and i have a YS 120 that i need the header for it or the muffler, any suggestions? the ys 120 is not supposed to have a muffler, but just the header, but i vent it a bit to much and the saito 180 needs the muffler for the back pressure, so maybe i could get away by tapping the back plate.