Honda GX 390 & Predator 420
1 Piece pipe measuring 12" from flange surface to center of pipe.
Available in Three primary sizes.
 .960" I.D. for restrictor motors,   
 .990" I.D. for stock, 
 1.000"I.D. for open
 Secondary same on all   1.250" O.D.  with  a 1.312" end 3"long.    
 31"total inside length