Muffler

On my way this weekend from Bale Breakers (Is Field 41 the best beer in the world or what?) to the Fresh Hops Ale Festival I snapped this pic at a stop sign. Can someone explain to me why a muffler center has a gun for a sign? Yeah I get it's called Bonnie & Clyde but the only thing I can think of is I don't want my muffler to sound like gun shots going off...