I’m building a turbo kit for my e46 m3 and would like to keep my cats as it’s a daily driver. But the cats are at the headers which will require heavy modifications as I have a bottom mount setup planned. N54 has a down pipe similar to e46 m3 but the cat is smaller and would required two or a y pipe either way. The biggest issue I see is the 3 sensors for the two cats. Can it be done and if so will it be worth it or just restrict too much and cause problems? Thank you in advance and if there is something similar posted sorry for that.