i m a lil stumped which one i need my headers has 1 5/8 ID but 1 3/4 OD so i m trying to buy right 4 to 1 header collector do i need the 1 5/8 one or 1 3/4? here s example
http://www.ebay.com/itm/Hooker-Headers-11522-Mild-Steel-4-into-1-Collectors-/310917962438?pt=Motors_Car_Truck_Parts_Accessories&hash=item4864279ac6&vxp=mtr
I would think the one that matches the od dimension
od dimension