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exhaust tips advice cats
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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?
  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
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