well it turns out that my header length is about eight inches measuring from the middle of the drop. If I go to 10 to 12 inches the outlets on my exhaust is right above my landing gear. Just to confirm again do you measure from half way around the bend to the end of the header or once you have the header coupled to the exhaust measure to where the canister opens up to its full diameter. I can't even run it to test it the way it is right now.