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From my experience
You do see a nice power gain from removing OEM cats, after tuning of course.
Alot of high flow aftermarket cats (100-200 cell) though will not pass your cars emmisions sniffer test requirements, even some 400 cell cats won't pass.
And sometimes, even when your highflow cat doesn't trigger a CEL code, you will fail a sniffer test.
In the end, if your not chasing that tenth of a second you are better off having a decent OEM cat/s and the car tuned to comply.
Or, risk it for the biscuit
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