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  1. Ford Crown Vic, Mercury Marauder, Grand Marquis
    Hey I have an 11 p7b and I've seen on videos and comments that you don't need all 4 cats on the vics? If that's true witch ones can you take off and will you still pass smog?
    exhaust tips advice cats
  2. Ford Crown Vic, Mercury Marauder, Grand Marquis
    I have a 2011 p71 and I was looking at the exhaust diagram and under the car for measurements for headers and stuff like that and I noticed it has 4 cats? Do you need all 4 cats? Or if not witch ones can you remove and still pass smog
    exhaust tips advice cats
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