Doesn't sound like anything other then decel resonation to me..... Loud pipes revved, and expect some garbling on decel, especially if sitting still.
You could see black smoke come out of the pipe one time you revved it. That's not lean.....
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012
"Your Jedi Mind tricks will not work on me...... ~Misinlink-2016~
2005 E.G. Classic
S&S 510 cams
Baisley Oil pump spring
SE 3.5" pipes
S&S adj pushrods