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De-catting the 2.5 TDI...

Discussion in 'A4/S4 forum(B5 Chassis)' started by Grant_H, Jun 25, 2013.

  1. Grant_H
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    Grant_H Member

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    Hi there,

    I'm interested in de-catting the car, and I think I'm having a bit of a hard time understanding just how many of them there are? :S

    I've read about a pre-cat, a cat and a DPF; I didn't think diesels had cats as they would clog too easily?

    Either case, I need to know which section of pipe needs replacing in order to eliminate all of the ****. I aim to keep the middle and back sections standard just in case I fancied replacing them at a later date.

    Hope that all made sense! Any info would be greatly appreciated :)

    - Grant
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  2. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    If its a B5, its probably just got one cat.
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  3. adamss24
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    adamss24 Well-Known Member

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    As above, if a b5 FWD then it's one cat, if quattro it will have 2 cats. Neither has a pre-cat, only cars from 2001 onwards got a pre-cat !
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  4. Grant_H
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    Grant_H Member

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    Cheers guys! So it's a case of just removing the downpipe from the turbo and knocking it through?

    Where's the DPF on these?
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