With these new ugly cars added (gauntlets and what not) is there a way to replace the hwy patrol ones for added cars??? Meaning is there a way to change the slot to add a custom asp vehicle? 

I guess just like the other replacement cars: Name it like one of those cars and place it in a newer patchday or own DLC - done.

You can replace all cars as you would normally with models like police2. However, it isn't recommended. Since Rockstar started adding police vehicles to the game, here is an updated list of all the ones so far as of Bottom Dollar Bounties and Agents of Sabotage (and ones yet to be released with drip-feed that I am aware of, though it should be available to modders with updated games)

 

police5 (Police Stanier LE)

polgauntlet (Police Gauntlet Hellfire)

polcaracara (Police Caracara 4x4)

polcoquette4 (Police Coquette D10)

poldominator10 (Police Dominator FX Interceptor)

poldorado (Police Dorado)

polgreenwood (Police Greenwood)

polimpaler6 (Police Impaler)

polimpaler5 (Police Impaler SZ)

polterminus (Police Terminus Patrol)

polfaction2 (Police Outreach Faction)

 

Of course, here is the list of vehicles prior to any DLC in a spoiler for people who want a centralized location for them all: (these vehicles work just fine replacing)

Spoiler

fbi (FIB Unmarked Buffalo)

fbi2 (FIB Unmarked Granger SUV)

pranger (Park Ranger Granger SUV)

policeb (Western Police Bike)

police (Police Stanier) (Not to be confused with the DLC "Stanier LE" version)

police2 (Police Buffalo)

police3 (Vapid Police Interceptor)

police4 (Unmarked Police Stanier)

policeold1 (Police Rancher Snow)

policeold2 (Police Albany Roadcruiser Snow)

riot (Riot)

riot2 (RCV Riot)

policet (Police Transporter Van)

sheriff (Sheriff Stanier) (Again, not to be confused with the DLC "Stanier LE" version)

sheriff2 (Sheriff Granger) 

lguard (Lifeguard Granger) (Not considered a police vehicle, but is considered an emergency class and replaceable)

firetruk (Firetruck) 

ambulance (Ambulance)

 

This topic has been moved to the appropriate forum. Please post in the correct location in the future.

This is exactly what I was looking for!! Many many thanks!