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Cat Delete = Better Gas Mileage?

6K views 7 replies 7 participants last post by  yeahyouknwit 
#1 ·
Would a cat delete on a 2000 mustang gt drop my gas mileage?

Looking to cut them and replace them with pipe. Wondering if it would hurt my MPG. Also, if I don't replace the two rear O2 sensors will it effect my performance or just pop the check engine light on?
 
#2 ·
#7 ·
The back 2 o2 sensors only monitor catalitic converter efficiency. So you cel will come on but it's nothing to worry about. Buy a tuner and shut them off
 
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