The flange between the section 1 & 2 in the E46 m3 section 1 don't have the same orientation as the Z4M section 1 flange. So it won't fit directly unless you cut the pipe, rotate and weld at the correct orientation the triangle flange.
I am looking to do the same thing on my car. I have 2 E46 M3 oem section 1 at home, i will keep the two straight pipe and weld the flange to fit the Z4M section 2 and also add some bungs.
I can sell the other 2 pipes with resonator and fit the flange and bungs if someone is interested.
It might not be clear but I will take pics in a week when I will come back from vacation.
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