Correct, XB9 has no valve. I learned this in a roundabout way when i took my airbox off to change plugs and discovered that the top of an XB9 airbox has a screw-on coverplate that says THUNDERSTORM 984 that covers...nothing. So why make nutserted mounting bosses just to mount a BS cover? Because that's where the actuator lives in a 12.
I actually just hung up with Kevin at Drummer and he told me to leave the valve *shut* for a muffler that acts closest to a stock XB9, and offered a helpful tip on how to get the kickstand bolt out.
Think I'll def send the exhaust his way, if not today, soon