I've decided to go a different direction with this, I'm going to cut the crossover after it reduces to 2.5" and weld on a flange or v band, so I can weld both the rear header and the bottom end of the crossover to the Y where it keeps leaking. it will give me the 1/8th of an inch I need and the ability to remove it all again without dropping the subframe.
so no flex pipe needed, and I picked up some stock gaskets.
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2004 Audi TT Quattro 1.8t
1969 Chevrolet Biscayne 2d
1963 VW Beetle
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