You could use the "added vehicles pack" which adds the police 3 police 4 pbus (buffalo LCPD, stinger police, ASCF Prison bus) and PBIKE (police bike) from TBOGT/EFLC and then replace the police bike with your one, enable it for ELS in the .ini and then play! AI also pull over for its sirens and lights that it comes with.
PS was watching this video just now!