ORIGINAL: mesaflyer
It's on the GP Venus 40 with an OS 55.
When I get home I will post some pictures, that is if my wife charged the camera battery[X(]
I ran a .46-AX in one of these but it was inverted with the stock muffler. You'll love he way that .55 sounds with the pitts.
Macs has some 90 degree fittings that might work:
http://www.macspro.com/accessories.asp