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  1. thelal

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    I used gumout type exhaust paste for years ; would last several weeks. easy to put on but gets old
  2. thelal

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    I've a re-occuring leak at top of Y-pipe and flange and that will throw a 420. I keep patching it but will be replacing with complete new exhaust system including headers
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