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Thread: RS4 B5 Pre-Cats

  1. #1
    Nez
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    RS4 B5 Pre-Cats

    Hi guys just find this out from the USA forum that the RS4 Pre-Cats are 400cel some as S4 and I was told that the RS4 B5 Pre-Cats are 200 cel am I missing something here

    Details:

    RS4
    Diameter = 2.3inch inner diameter
    Pre-Cats = YES
    O2 Sensor location fore and aft of cats = YES
    Test Pipes = NO
    Flex Joints = YES (metal mesh/bellows-type)
    Cat Type = Precat-precious metal, main cat=ceramic 400cel

    I am asking this because I found a RS4 Pre-Cats for 150
    (Audi S4 351.9 PS, 603 Nm, MRC Custom Remap XS Power DP's, Cat Back Exhaust, Forge DV, RS4 Intercoolers, RS4 Breaks and Induction kit)



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  3. #2
    "Stick a V8 in it!"

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    afaik its the main RS4 cats that are 200cell not the pre-cats.

    You really dont want any cat hanging off the turbo like that, get a set of XS Power downpipes from ebay, they're about 130ish iirc, and then get them mated onto the front of your existing system.

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  4. #3
    Nez
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    Quote Originally Posted by aragorn View Post
    afaik its the main RS4 cats that are 200cell not the pre-cats.

    You really dont want any cat hanging off the turbo like that, get a set of XS Power downpipes from ebay, they're about 130ish iirc, and then get them mated onto the front of your existing system.
    Cool thanks for clearing that out about the XS Power I asked the seller about the downpipe if he just could sell the downpipe only as I don;t want the di-cats and I am still waiting for the reply

    By the way if I buy the XS Power down pipe then can I just welding it to my powerflow exhaust system or do I need the fitting parts
    (Audi S4 351.9 PS, 603 Nm, MRC Custom Remap XS Power DP's, Cat Back Exhaust, Forge DV, RS4 Intercoolers, RS4 Breaks and Induction kit)



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  5. #4
    stapo69's Avatar
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    When you say you found rs4 pre-cats, do you mean the whole downpipes? Cos you can just buy them and gut them, good for 400+ brake
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  6. #5
    stoakseya4's Avatar
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    I have a pair of RS4 DPs for sale at the moment, currently with Cats - 150.

    PM me.
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  7. #6
    Nez
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    Quote Originally Posted by stapo69 View Post
    When you say you found rs4 pre-cats, do you mean the whole downpipes? Cos you can just buy them and gut them, good for 400+ brake
    Yea its the whole downpipes for 150
    (Audi S4 351.9 PS, 603 Nm, MRC Custom Remap XS Power DP's, Cat Back Exhaust, Forge DV, RS4 Intercoolers, RS4 Breaks and Induction kit)



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  8. #7
    "Stick a V8 in it!"

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    still need to go thru the hassle of gutting them, but it might well be the easiest option to get two shiney cats

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  9. #8
    Nez
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    Quote Originally Posted by aragorn View Post
    still need to go thru the hassle of gutting them, but it might well be the easiest option to get two shiney cats
    Yea you right that would be easy option but costly one to me as I already get the de-cat I just need a downpipe with 2 sport cats.
    Last edited by Nez; 2nd September 2009 at 16:47.
    (Audi S4 351.9 PS, 603 Nm, MRC Custom Remap XS Power DP's, Cat Back Exhaust, Forge DV, RS4 Intercoolers, RS4 Breaks and Induction kit)



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