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.