BrokenFang
XS400 Addict
I cut up some old 4 into 2 Honda pipes i think. the outside diameter is about the same as my mac 2 into one. i have figured out how to make it fit into block proper. the big question is when i weld the 2 double wall pipes i was thinking about putting a 45 degree grind on the end of both pieces. this way im thinking i can weld center pipe then fill weld outer. its all gonna be in header wrap so weld wont show. full pipe length should be at least 3 feet or so. do you think the reduced inside diameter will help with back-pressure on engine or hurt me. due to the double wall i have reduced inside of pipe at leas 3/16 of an inch.
