Are header tubes measured by outside diameter or inside diameter ?
novasb2 · Registered Joined Mar 12, 2011 · 46 Posts Discussion Starter · #1 · Jan 19, 2013 Only show this user Are header tubes measured by outside diameter or inside diameter ?
novasb2 · Registered Joined Mar 12, 2011 · 46 Posts Discussion Starter · #3 · Jan 19, 2013 Only show this user Thats what I thought, Thank you for the quick answer
