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I will try to take pics, not only of the exterior but also the inside of the pipe to show the quality.
I used to have Ebay headers on the M3 for 4 years and I never had a problem with them. Since they were cheap headers, I modify them back in 2010 and cut them directly at the collector. Then I saw why they were cheap. The welding and assembly are not made to have the perfect flow but just to be solid. After I cut them, I start with two 2.5" pipes from the collectors and merge them into a single 3" pipe from section 1 to the rear with only one muffler with turn down. It was looking a lot like Bimmerworld race exhaust.
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