Adjusted my valves (with the help of 09VTX1300C and Fuman) last time I was home, after I got it all back together (torn apart for paint) I fired it up and the exhaust sounds totally different. Is this even possible? I could not hear the tapping before, now I can, I know this is normal and not what I'm talking about. The actual exhaust sounds different. The bike still seems to run good. Any ideas?