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BMW has better quality, the process used to make the CSL headers is way more expensive as well, the collectors are superior from all angles, CSL headers are even better then AA headers for sure, I had opportunity of check the quality of each one and I can stand behind of my opinion, I don't see any real reason to have a higher markup price besides of to make more profit, in fact between AA, CSL, EURO and SS, SS has the lowest quality and similar design overall.
1- CSL
2- AA (only because of the design and not because the manufactory process)
3- Euro (because manufactory process)
4- SS ( similar design to euro headers, low quality manufactory process)
I did not see the stepped version of the SS so I can't talk about that one.
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