Some of the technical info from these mufflers:
	Quote:
	
	
		| Body Configuration: Offset - Offset
 Body Cross Section Diameter: 6"
 Body Length: 17 in
 Inlet Configuration: Offset
 Muffler Body Height (in): 6 in.
 Muffler Body Width (in): 6 in.
 Muffler Inlet Connection Type: Pipe Connection
 Muffler Inlet Count: 1
 Muffler Inlet Diameter 1 (in): 1 1/2"
 Muffler Inlet Diameter Designation: I.D.
 Muffler Inlet I.D.: 1 1/2"
 Muffler Material: Steel
 Muffler Outlet Connection Type: Pipe Connection
 Muffler Outlet Count: 1
 Muffler Outlet Diameter (in): 1 1/2"
 Muffler Outlet Diameter Designation: I.D.
 Muffler Outlet I.D.: 1 1/2"
 Muffler Shape: Round
 Outlet Configuration: Offset
 Overall Length: 24 in.
 Reversible: No
 Shell Length: 17"
 UNSPSC: 25173702
 | 
	
 
Note the info on "reversible". Then again, I am not sure if I directed the ones I have used (I have done 3 different carriers in the past few years using these mufflers). All are nice and quiet. I did drill a drain hole in the low spot of the mufflers as well as the pipes to allow water condensation to escape.