To unlock additional gang styles for use in Saints Row The Third, follow the instructions below:
Cops/SWAT: Complete all SNATCH missions for Kinzie Deckers: Complete Mission 37 Hos: Complete all SNATCH missions for Zimos Luchadores: Complete Mission 43 Mascots: Complete all Prof. Genki S.E.are.C. Instances Morningstar: Complete Mission 29 National Guard: Complete all TANK MAYHEM instances Space Saints: Complete Mission 47 Strippers: Complete all ESCORT missions for Zimos Wrestlers: Complete all TIGER ESCORT instances
Certain vehicles can ordinarily not be customized. There is a way round this, however.
Go to a Rim Jobs Garage, using a standard customizable vehicle, then go into your garage from the Rim Jobs menu. Highlight a non-customizable vehicle and then go back and choose 'Accept'. The non-customizable vehicle should now be present in the garage and allow you to at least change it's color.