i believe the impulses are running vector 1/8 gearing with the 1/8 centax clutch as well. maybe for a big track, you need those gears to work. but for smaller track, those gears are useless and super heavy!!!. I know that because i'm using it.
i drive an impulse pro but the mugens centax clutch looks lighter and smaller = less weight. most of the people i know, tells me i drive a tank, because its heavy-----duty as well.
maybe mugen mtx2 can use its big brother mrx3 gears?
serpent vector stock 1/8 gears 16/19T 45/48T
hope it helps.