I had same issues with what sounds like the same pipes. After I rejetted both and adjusted mixture, it still sounded like a cannon. All it took was 2 shims under the needles and bike runs AWESOME. Had it dyno'd after the fact and am running top performance with what I have. Easy job to put in shims.

Best looking black girl around! 2004 SM-spokes, solo seat, lowered rear, 14 in apes, bobber rear fender, no front fender. Flat black all the way around. Jeff