Looked at the installation link to see how they go on. I suspect that there will be performance issues with the exhaust hitting a brick wall (T Pipe) on the output side of the cat. There is no way to direct the flow either (like the angle differential on a "Y" pipe) to insure that you will get anywhere near even flow on both sides. For a NA car this would work OK, but I would be wary of using this on any kind of a turbo or even a supercharged engine. Thats my
2 cents.
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