ive resently bought an 09 M800, stock pipes are way too quiet, vance & hines dont do any with lambda sensor mountings, only ones ive found so far are from highway hawks, short cut pipes (653-500 part number)no need to change airfilter as no one does one, and no need to fit power commander or fuel pack, takes care of its self,had mine for the last 3 months,frigging love it, ride safe peoples.