This is your best friend. Ghost Rider has massive health, and the Minigun is the only weapon that can deplete his 30,000 HP fast enough.
Useful for knockback, though Ghost Rider is surprisingly agile. gta-san-andreas-defeat-ghost-rider-mod
You can find various versions of this mod, including the Final Edition for PC or specialized CLEO scripts for Android, on community sites like GTAall or YouTube tutorial links . This is your best friend