He said "LOW END" not low power.
Like others have said. Get the compression up any way you'd like, get a set of PTR mids, V-force reeds may my low end a little crisper, advance the timing. Shaving the flywheel is a double edged sword, it revs quicker but "tends" to fall off the pipe quicker. With a pipe like the PTR, you never really fall off the pipe because it pulls from so low. If you really want to wake up the low end, search up RZ.