dang bruce english please lol :lol: i,m looking at lemon headers to make me a set 2-1/8 or 2-1/2 primary's to a 4" collectors then a set of jeg's #520-11139. 4" to 3-1/2. then tubing to the muffler still 3-1/2 to The turn downs. or would you go with a 3" what would you change. Ron612