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Cut the flanges off then use one of these - https://www.eurocarparts.com/search/712440111?type=shopping&gclid=EAIaIQobChMIkami7uOU6AIVl-DICh0pqAnwEAQYAiABEgIXffD_BwE


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Another consideration is, how are you going to get a comprehensive weld all around the new joints in-situ? Most exhausts sit close enough to the underside of the floorpan that it'd be difficult, if not impossible, to get a welding torch in above them, and if you leave even the tiniest gap it'll blow...


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Since the flanges have corroded away , why do you think there is enough metal left in the pipes to make it worth welding them? Also modern exhaust systems are 13 % chrome which can easily crack when welded ,depending on filler metal and the two components being joined. But if the whole system is welded ,flanges are not necessary.


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You gave the obvious and real reason - about replacing sections... Often the only way to get an exhaust into place is for it to be in two, three or more parts that are then joined either with flanges or sleeved and clamped. I have made exhausts and welded in situ, but if they get damaged it can be a pain to repair later - a risk one takes...


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Let us assume that it is water (H2O) only dripping out of your car exhaust!! Good news is that, your engine is optimally tune. So, it is able to combust almost each molecule of your car fuel, which is a hydro-carbon, Hydrogen and Carbon. The intake manifold is pumping the accurate mixture of fuel and oxygen into the combination unit and your car is burning ...


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