First of all there is chan's banshee which has a rear spoiler and unique colours. You can obtain this vehicle only once at the end of the mission - Clear the Pier, where you have to chase chan down and kill him, if you damage the car a lot without completely wrecking it. Chan will jump out and you can finish the mission and take it back to your garage. You cannot obtain this in replay missions because the mission ends after you kill chan. Try not to hit anything on your way back to your garage because the car will be on the verge of explosion, and if you really want this car turn off Autosave because if you complete the mission, get the car and accidentally blow it up you can restart from before the mission and try again.
There are two more in the Wade Heston mission Torpedo run they are both boats though and cannot be saved. The first one is the Destroyer armed with torpedoes.The second one is the boat that you have to blow up. Blow it up then it tells you one has already offloaded it's cargo. Head to the Jetty and see it sitting there. Take it for a ride, It's really slow and kinda resembles the Tug Boat from GTA IV but a lot smaller, and is called a Zhouboat. Although the one you have to destroy is capable of dropping mines, you can't drop mines once you're in one.
EDIT: I'm going to start listing them by editing this post.
- Chan's Banshee - Clear the Pier
- Heston's Black Admiral - Evidence Dash
- IAD Cognoscenti with Siren - Evidence Dash
- Scrambler Burrito - Scrambled, found out that this is not a Burrito but a Gumshoe http://www.gtaforums...howtopic=410503
- Black Admiral with Siren - Raw Deal
- Destroyer [Boat] - Torpedo Run
- Zhouboat [Boat] - Torpedo Run
- Salvage Reefer [Boat] - So near, yet Sonar
- Cruiser [Boat] - Salt in the Wound - Also found here http://snapmap.wikig...tion&set=99,610
- Ammunation Yankee - Faster than normal Yankee.
- Gang Drug Burrito Vans - Can perform burnouts and are a little faster than normal ones.
- Purple & White Triad Admirals - Can perform burnouts while normal Admirals can't.
- Russian Mafia Cavalcade FXT - Can perform burnouts and is faster than normal, also looks
- different than normal ones, with Neon lights on the bottom and lights on the roof.
- Coast Guard Launch [Boat] - The Coast Guard Launch only has one set location http://snapmap.wikig...ion&set=286,675
- BP Cabbie - 15 Taxi fares in a row.
- BP Patriot - Unknown how to unlock.
- BP Infernus - Amazon preorder Bonus
- BP Hellenbach - Link with Social club between may 1st & 8th. Sorry guys, this has ended!
- Thanks to GTA_Loco for his topic for "DP/BP/EP/FP Duke?"
- Thanks again GTA_Loco for "Bulletproof Comet and Minigun with infinite ammo"
Thanks to everyone who has contributed.
- BP = Bulletproof
- FP = Fireproof
- DP = Damage Proof
- EP = Everything Proof