The Invisible Velocity Loot Items were added to the inventory on August 16, 2012. Now the Invisible Velocity Mission is open. Like we needed more to do in Mafia Wars right now.
Here is a guide to the Invisible Velocity Mission.
Part 1: In Transit
Part 2: The Right Kind Of House
Part 3: Gloss Of Speed
Part 4: Sunset Haze
Part 5: Solitude
Part 6: Scumbag Blues
Part 7: Slow On The Uptake
Part 8: Afterburner
Part 9: Planetary (GO!)
Part 10: Soul On Display
You will also be rewarded with experience for each part of the mission that you complete. The amount of experience that you will be rewarded with will be determined by your level.