I recently found a set of Macht Schnell headers on FB Marketplace, I couldn't find much info on them, but Macht Schnell is a reputable brand and they were cheap so I went for it.
First, I'm curious if anyone has any experience with these, I don't see them mentioned on the forums often, or ever. All I can find is product posts by EAS and a dyno video on YouTube also by EAS.
Second, and forgive my ignorance, how are headers like this mated to section 1? I've seen a few others that use this style, but couldn't find any info on how they're installed. Only one header has the flange welded to bolt to section 1, the other header is just smooth like a slip fit. Should there be a slip-on flange? Some pictures I found online for reference:

First, I'm curious if anyone has any experience with these, I don't see them mentioned on the forums often, or ever. All I can find is product posts by EAS and a dyno video on YouTube also by EAS.
Second, and forgive my ignorance, how are headers like this mated to section 1? I've seen a few others that use this style, but couldn't find any info on how they're installed. Only one header has the flange welded to bolt to section 1, the other header is just smooth like a slip fit. Should there be a slip-on flange? Some pictures I found online for reference:
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