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They both work the same way, just different shapes. Once is a L, one is a more curved piece. Screw one end into the downpipe, then screw the o2 sensor into it. It removes the o2 sensor from the exhaust stream so it will see lower levels of pollutants and in turn trick the car into thinking a catalytic converter is removing them.
 

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Discussion Starter · #5 ·
They both work the same way, just different shapes. Once is a L, one is a more curved piece. Screw one end into the downpipe, then screw the o2 sensor into it. It removes the o2 sensor from the exhaust stream so it will see lower levels of pollutants and in turn trick the car into thinking a catalytic converter is removing them.
Awsome thank you
 

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All I can say is the Dormans will not work without modification due to the length of our CMS sensor body.
 

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The inserts restrict the opening. Some may still see a mil illuminated with no insert. Some put the middle size insert and it is what works for them.
 

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2023 Jeep Gladiator Rubicon 6spd, 2019 Mustang Bullitt
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I use a Vibrant "J" style with the medium insert on my CJPP Catless DP. My rear O2 is turned on, and i have not gotten any codes.
 

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I have a DIY Dorman defouler just laying around if you want it, free of charge. I didn't have a drill bit big enough to bore it out so the O2 sensor could fit. I just ended buying the J shaped Vibrant defouler.
 

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Anyone using the vibrant with no insert and not getting codes?
 
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