I know in tow mode it is supposed to be locked out but a friend of mine at work has a Charger Daytona that has the center shifter, On his if u ratchet the shifter till it says 5 and leave it there instead of 1 more were it is blank he said it will not go to MDS, My truck doesn't have an indicater to tell me if its working or not, I understand that if u have aftermarket exhaust u can hear it change so I was going to see if someone would try this, also if u have a coloum shift can u still shift 1 thru 5 manuelly?

 

Can't help you with the aftermarket exhaust deal... but ya, you can shift maually with the column shifter

 

yeah mds doesnt kick on when using shifter instead of auto.