Take out a loan at the Loan Office Activity. After a few days if you don't pay it back 2 guys will come after you. They show up about once a day until you make it to the Peterliner waves - in which they'll show up a few times a day. While you have a loan your on-screen money value (near the top right) will display in red. It flashes when the loan collectors are nearby.
Number of Waves - Vehicle - Weapon 1 - Jackrabbit - Vice 9 Pistol 5 - La Fuerza - Vice 9 Pistol 4 - Bulldog - .44 Shepard Pistol 5 - Peterliner - Tombstone Shotgun Inf - Helicopter - (some type of auto-rifle)
I did this Activity to get a Bulldog to turn in to the Chop Shop, but the Bulldog they drive up in is a custom version and can not be modified. The Peterliner is also a custom version. By "custom" I mean that they're white and have a "1st Born Loans" logo on the side.
Yeah, I spent over 500 hours on SR2, and now I'm playing through this one for the first time. I know I'm really late to the game, but I couldn't find the information above so I thought I'd share it for anyone else who happens to try to look it up.
I don't have xbox Live or I'd join you in a heartbeat.