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I agree with JC5 and thanks to him cuz I bought coated supersprint headers off him.
You will need two 2.25" cats and you can have a shop weld flanges on them and attach them post header, then weld 2 bungs in post cat and have them extend your o2 sensor cables.
This is a must or you will get CEL. The o2 sensor adapters that move the sensors out of the way don't work for BMW's. They have a high and a low range that they need otherwise CEL. So too much or too little causes CEL.
I suggest just getting 2 catco highflows. I've found these to be the most affordable and the car will still pass emissions.
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