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Well I just checked with Ray Crowe at Malloy Mazda on the price of a new pipe - turns out this part is out of production and there isn't a single one left anywhere in Mazda's inventory. So price is a moot point and a repair of the existing part or fabbing up custom flanges & AN lines are the only way to go.
Time is really tight for me now (damned day job!), but I plan to pull the pipe off ASAP, and get a better look at it from the inside. If it looks like the inside is free of corrosion, and if the elbow is solidly attached to the flange and shows no signs that it could get worse, I'll take the gamble and soldier on to DGRR with it as is, and ship it off to Garfinkle's when I return for a repair or getting custom AN flanges made up. What I might try doing while it's out is see if I can squeeze some RTV in the space between that shield piece and the exterior of the elbow while it's off - that might be sufficient to reduce/stop the leak temporarily if it's not under much pressure.
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