These are vehicles that can be purchased at safehouses and other locations

Code - Effect

Bulletproof BF Injection - Complete "Beach Patrol" (Sunshine Autos)
Bulletproof Sanchez - Complete "Conduct Unbecoming" (First safehouse)
Bulletproof Stretch - Complete "Kill Phil" (Sunshine Autos)
Bulletproof Ventoso - Complete "From Zero to Hero" (King Knuts, Downtown)
Little Willie - Complete "From Zero to Hero" (On roof of third safehouse)
Quad Bike - Complete "When Funday Comes" (Sunshine Autos)
Skimmer - Complete "From Zero to Hero" (Behind third safehouse)
SPLITZ-6 ATV - Complete "From Zero to Hero" (Second safehouse)