"Okay, Mike. The Mafia is ready to help us get out of the city, but we're going to need a car - a fast one. Head over to Atlantic Quays. There's a Banshee sitting in the lot just waiting to be taken. Grab it, get it spray painted. then drop it off at the hideout."
Vinnie informs Mike that the Mafia (likely the Leone Family) have agreed to help them leave Liberty City. However, they need a fast car and one is waiting to be taken in Atlantic Quays. Mike drives to the car's location, kills an attendant and drives to the Pay 'n' Spray in Portland Harbor, to lose any interest from the police. Mike takes the Banshee back to the hideout and is paged by Vinnie, asking him to return to the restaurant.
Post mission pager message
Vinnie: Hey, Mike. I got an opportunity for us. Get on back to the restaurant. Vinnie.
The reward for completing the mission is $3,000 and unlocking the mission Ill-Gotten.