An update from the 50-class
ProMuffler, the new
v2
is optimized for larger displacement 55-class engines running 15-30% nitro (but
still works nicely on the 50). Quiet, and with throaty rasp at full
song, it allows the engine to mantain its full rated power with an easy
set-it-and-forget-it needle valve adjustment.
Click photo for more information