I recently purchased man-a-fre's three piece header and upon installing them I realized that the old exhaust pipe has an air injection tube that meets up with the exhaust just before the cat converter. I notice there is no place to hook this up with the header y-pipe and was wondering what to do about this. Should I cut the old injection tube off and cut and weld it into the y-pipe or forget it and just block it off? Without it I am afraid I may burn up my cat converter before long. Is this the case or not?