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Hey Steve-
One of my other cars was catless for a period of time and the smell got to me so I ended up putting cats back on. My F10 is my daily driver and had stock downpipes on it when I purchased it. I installed high flow cats and have been extremely happy. Performance, smell, and sound are good. I went with a downpipe that appears to be off the market now. It is made by AMS and has GESI cats which are high quality. It was pretty expensive, but it has served me well. Good luck!
Edwin
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