Wait, what am I missing here? He literally only moved the V-band clamp to the other side of the flex pipe? No change in the header geometry, no elimination of the sink trap, just easier access to an allegedly inferior flex?
Also, 400 series stainless steel is definitely magnetic and is less likely to have galvanic corrosion problems when mated to mild steel so it's frequently used for automotive products.
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I built "the jig" and cut through the bend with the flange off the sink trap. Used a sawzall for cuts because I was at home so I had to finish the bend angle on the grinder because I was off by about 7 degrees.
Used a 3 inch round piece of 316 pipe stock to fill out and shorten up where the flex was, but if you go catted and want to make another cut you can use the included straight pipe instead of sourcing extra parts.
Welded a 53009 Magnaflow to the flex, and it will clamp into the rear O2 flanged piece. The cat is about 2 inches longer then the included straight pipe but fits perfectly since you actually lose almost 2 inches in length removing the sink trap.
Reused the SD flex. Why? Because where it comes installed it flexes way too much because it's the only flex point. When the engine rocks the stock flex pipe feels it every time. Relocating it to a horizontal position allows the whole under car section to move on the hangers with the engine without flexing the flex pipe.
2 cuts. 3 welds. 4 hours. It took longer building the jig.
