I wanted to suggest this too, 2000 hp seems fine by me, but 3000 hp and disable 1 shot gas tank it's a bit too much if you ask me. It can't be OP since only one passenger can shoot, and SWAT enforcer is really slow. Maybe add the ability that players can buff their own cars too? But for a really big price (I don't know if this is possible for individual cars).
+1 only for 2000 hp without any other modification.