
I ordered this because my catalytic converter was stolen and I opted for the catalytic converter screw and pipe (1pc). I installed all the parts in Honda Element 03. Installation was easy for this part. Walker Part #31378 is for Downstream (after Cat) and P/N 31531 is for Upstream (after Manifold). The upstream installation required a bit of cleanup on the inside of the washer/donut. Also, the upper part is different from what is shown in the picture. In general I am very satisfied with the spare parts, they are much cheaper than the original ones, just need to finish this part.

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