Motorsports and Romance: Gunpowder Arc

Romance, jealously and high octane fuel; Nitromethane is in the air ! The Sonic crew are in equestria with the mane6 to compete in the Pony Derby in Fillidelphia (old summary). Sonic chases down a gangster who owns a firearm- that doesnt sound unusual but... Equestria hasnt had a firearm a thousand years. What is this gangster and his gang up to? What has Sonic gotten himself into!