How many miles? Also I see it's an Auto.. take it in. There's been a TSB out for 4 years now on the AFM's lifter setup, ticks just like that and it's a fault in the system.
2010 2SS/RS M6
Black on Black, Silver Rally Stripes, NPP Exhaust, 1LE Rear Diffuser
1996 S10 ZR2 M5 "HD"
1" lift, brush guard/skid plate upgrade, Nerf Bar/fogs