How much power does a racing catalytic converter deliver? And does the exhaust emission standard change?
You can't say that across the board. It depends on the position, the size, and the software. The number of cells, whether 100 or 200, also influences the performance.
https://www.bar-tek.com/help-center/service/how-much-power-does-a-racing-catalytic-converter-deliver-and-does-the-exhaust-emission-standard-change
When using a racing catalytic converter, the exhaust emission standard does not necessarily change. This is due to the catalytic converter and is also stated in the product description.
HJS Kats are available with ECE approval. You can find them here.