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I purchased an ER downpipe for my 328xi N20 and I just tried to have it installed at a performance shop today. They called me back and said that the new downpipe was 2mm too big and would require another 2 1/2 hours of labor to machine it back down to the exact OEM size. I told them to put the old one back in it for now until I contact ER. They've been working with the performance shop to figure out what went on, but I'm not exactly too happy as I now have an incorrectly sized downpipe and am out the money for 2 hours of labor.
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