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Many differences between pre/post 17 models outside EUDM, bigger air filter, better intake tube, improved aluminum intake manifold, bigger/better exhaust manifold, mapping etc, they all contribute to the power increase!
Of course they could achieve with other changes the same results for the EUDM models but the cost of R&D probably doesn't justify the minor power increase that would be only for the low sales European market.
By the way my EUDM MY18 says Euro 6+ on the approval.
Back to the question, so many exhaust manufacturers, suppliers, tuners out there, they did this job before you for you and they sure know more than what you know theoretical and empirical.
Just have a look at the dyno results from each different header and make your choice, don't overthink as previous say you won't discover the wheel...
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