Here is a map they made with the most active locations.
those are pretty accurate!!!
Valentine One (3.858 Ice Cream Truck, 3.812 in Vette)
4 Head LI (On Vette) (7.11 CPU Regular heads front, HP Heads on the rear)
9500ci (On Vette)
LI Quad (On Ice Cream Truck)
LI Dual (On SRX, 7.06 CPU)
ProLaser II, ProLaser III, Stalker LZ-1, LTI Marksman & Laser Atlanta "R" (looking for an Ultralyte LRB)
2008 Corvette Z-51 Coupe
Escort 9500 ix (Cadillac SRX)