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Thread: 2009 G8 Catalytic Converter- Different Part Numbers?

  1. #1
    Member Sprinkle's Avatar
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    Question 2009 G8 Catalytic Converter- Different Part Numbers?

    Hey guys I am hoping to find an answer here as I can't find it anywhere else and even the dealerships couldn't tell me the difference...

    I am trying to sell my stock cats from my 2009.5 G8 GT. Part numbers stamped on my cats end in 7817 & 7816. From that same year (I assume before the redesign), there were converters produced with part numbers ending in 1315 & 1316.

    What is the difference between what I assume are the 2009 cats (1315 & 1316) and the 2009.5 (7817 & 7816) cats?

    Everyone interested in buying them only want the 1315 & 1316 cats but NO ONE can tell me what the design difference between these 2 types of cats are...

    Pictures attached are what I could find from GM Direct & then my actual cats.
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  2. #2
    Too many projects.
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    RPO Code between them is different.

    09 & 09.5 I imagine with the additional changes.

    GXP includes the same RPO as 7816/7 and all GXPs are 09.5.
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