Curious what would be the HP gain from these? I would assume u can compare the gain as same for Supersprint headers. Also they would require a tune to take full advantage of them also. Does anybody have any dyno sheets or logs to view that show real world gains?

Also is there any cheap way to flash these cars with a k-line or brav-tec cable? I have this ability in my 335i N54 it's pretty much open source tuning. Not sure if this platforms has that ability?

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2006 E53 4.4i | 2008 E92 335i | 2008 E61 535xi | 2011 E70 35i