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downpipe&decat information

Discussion in 'A3/S3 Forum (8L Chassis)' started by joebickerton89, Jan 28, 2013.

  1. joebickerton89
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    joebickerton89 Member

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    [Jan 28, 2013]
    hi all maybe a silly question but ive been looking for the answer for a good half hour now so thought i would just ask you lot. im going with a new downpipe and decat now 3" and i was just wondering if the decat was also 3" and how it would mate upto a 2.5 or 2.75" exhaust once the cat meets the rest of my exhaust..probably a silly question and im sorry for asking haha. any help is great
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  3. joebickerton89
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    joebickerton89 Member

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    [Jan 28, 2013]
    think ive answered my own question now looking at most downpipe and decat packages the decat gets slimmer at the exhaust end :p
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  4. A3-Lee
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    A3-Lee Active Member

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    [Jan 28, 2013]
    Correct joe it tappers down
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  5. Prawn
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    Prawn My other car is a MINI!!!!

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    [Jan 28, 2013]
    the downpipe is 3'' the whole way mate, then the decat section reduces from 3-2.5-2.25 to work with the standard exhaust.

    If you ever upgrade to a 2.5'' catback system you can cut the 2.25'' section out and replace it with a bit of 2.5'' pipe to keep the diameter the whole way through :)
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  6. joebickerton89
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    joebickerton89 Member

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    [Jan 28, 2013]
    thanks buddy's :)
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