One of the great joys is hearing and playing the sounds of a motorcycle engine. There's burbling on a closed throttle, revving an engine and hearing the distinct low idle bops begin to blend then rise and eventually wail at high rpm. Throttle blipping during midrange downshifts when running hard and on and on. Today was a trial run on the ST after working on it all winter. We've only had 150 miles of seat time together and that was back in October and November. I can report the engine and exhaust notes are deliciously smooth and somehow remind me of a milder version of a crossplane Yamaha. It's got to be one of the best sounds I've heard in motorcycling. Other greats of the past include my '72 Kawasaki 500 H1B with baffles cut down from roughly 12" to 3". What a surreal echoing howl that made. Believe it or not a Kawasaki EX500 in a superb state of tune sounded fantastic and had a huge variation of tone as rpm changed. My Triumph TT600 with baffled Skorpion pipe is thrilling as you approach 14K on the tach without being overly loud. I reveled in the sound of my '72 Honda SL350 and it's stock fiberglass pipes back in the day. These days I appreciate a quiet and smooth tone and the ST is just about perfect.