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  1. #1
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    CP-E Catless and Catted Downpipes

    Hi,

    Does anyone know the HP difference between CP-E Catless and Catted downpipes and which one is better to have in the N54? Click here to enlarge

    Thanks

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    Better is a point of view. Catless means you have no catalytic converters. There is marginally more power but you'll get a service engine soon light for catalyst inefficiency unless you get an O2 simulator. Some also complain of exhaust smell without cats. Catted means you'll have a catalytic converter, pay more, no ses light, normal smell, will pass emissions but lose ~5 whp. You pick.

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    Click here to enlarge Originally Posted by boom Click here to enlarge
    Better is a point of view. Catless means you have no catalytic converters. There is marginally more power but you'll get a service engine soon light for catalyst inefficiency unless you get an O2 simulator. Some also complain of exhaust smell without cats. Catted means you'll have a catalytic converter, pay more, no ses light, normal smell, will pass emissions but lose ~5 whp. You pick.
    Thanks, there is not much HP difference between the two, unless you are racing.:auto-swerve:
    And price of course!

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    Everything I have read and everyone I have spoke to echoes what boom said. Until you are talking about really large amounts of boost the difference is negligible on high flow or 'race' cats (even at 28psi the worst I saw was a 8 whp loss). For those of us working in the 12-16 lb. range it looks like between 2 and 5 whp less than fully catless. All in all it's personal preference and budget. Downpipes are a solid upgrade on the n54 either way to go.
    Click here to enlarge

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    If you want the last bit of power then get the catless pipes, but don't forget you will get the SES light.
    This is my signature... Click here to enlarge

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    Click here to enlarge Originally Posted by BadBoostedBmwM3 Click here to enlarge
    If you want the last bit of power then get the catless pipes, but don't forget you will get the SES light.
    Which gives you a good excuse to get a tune Click here to enlarge

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    Click here to enlarge Originally Posted by SSDD Click here to enlarge
    Everything I have read and everyone I have spoke to echoes what boom said. Until you are talking about really large amounts of boost the difference is negligible on high flow or 'race' cats (even at 28psi the worst I saw was a 8 whp loss). For those of us working in the 12-16 lb. range it looks like between 2 and 5 whp less than fully catless. All in all it's personal preference and budget. Downpipes are a solid upgrade on the n54 either way to go.
    Yes I guess i does boils down to price!!!

    Thanks! :character-mrt:

  8. #8
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Which gives you a good excuse to get a tune Click here to enlarge
    Truth...
    This is my signature... Click here to enlarge

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