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Front o2 sensor is A/F and rear is Pass/fail of the cat. Cat's need heated to a certain range to work right. Bigger is not better. webtech even states the above in regards to the o2 sensor.
when i did my resonater delete on my 08 tibby i used band clamps they work f-ing amazing. and napa or j/k auto parts and sometimes local stores have them usually 10bux a piece