Stang exhaust
 

2001 4.6 GT Mustang with after market exhaust. Doing some racing and took the cat's out. Have two sets of sensor's on each pipe. Dealer say's my front sensor's OK but back sensor's after where the cat's should be lighting service engine light. How can I take care of this problem so the service engine light stay's off with no cat's on my H pipes. Loren