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Discussion Starter #1 (Edited)
Hey guys I'm tryna make my own custom 3inch exhaust for my 3.0T my idea is to use 3in pipe an X-pipe, 2 flowmaster super 44 muffler, my only issue is what flanges should I get for the exhaust to fit the stock catalytic converter? What is the diameter of the catalytic converter what flanges should I use?
 

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2018 Q50S [RWD]
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The Lower Downpipes flange or the upper downpipes? Are you not planning to install lower downpipes? Is this for a 3.0t or a 3.7? A lot of unmentioned variables.
 

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Discussion Starter #3
It's for a 3.0T I do plan on putting full 3"inch downpipes but I want to find out what size flange would fit on the stock Cats to weld on to make an exhaust
 
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