4KQ Exhaust downpipe flange to catalytic converter

Huw Powell audi at mediaone.net
Mon Sep 17 15:42:31 EDT 2001

carl krivutza wrote:
> Hello all,
> I was under the 'ol girl yesterday to fix a slight exhaust leak somewhere around the cat and replace some suspect hardware.  The plan was to remove the cat and re-assemble with all new hardware.  I got the cat out without much problem and noticed that there was a metal band around the flange of the downpipe that connects to the cat.  It turns out that the band is a big hose clamp that apparently was holding the flange together.  It is in two pieces (actually three because one broke) or "slices" would be a better description.  The flange is pretty rough but I suppose as long as everything is lined up properly, it could be re-used.  Who else out there has BTDT with this operation?  Suggestions/advice is greatly appreciated as usual.

replacement two piece flanges are avail. at import parts shops (I know
Atlantic stocks them).

they bolt together from the side and form the piece you need.  A lot
easier than swapping the downpipe!

Huw Powell



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