I thought I was going to light the fires again last weekend, but when I chopped off the OEM flanges into the resonator, I found one to be 1 7/8 OD and the other to be much closer to 2". So my 1 7/8" ID adapter from my 2" cat fit over one pipe, but was useless on the other.


Is that a design feature, or a manufacturing defect?

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2001 E53 3.0 5pd