Hey buddy,
I live in Switzerland, I have the n55 + wireless + Akra slip-ons and trust me with the valve open it is plenty loud!
You shouldn't risk putting anything else than n55 midpipes because it will cost you dearly if you get caught! For the price difference (CHF 2500.- more for Akra midpipe vs N55) and the risk of getting your akra midpipe confiscated and having to pay the hefty fine, and the sliiighlty louder better sound because of the lack of any cat (N55 has the first cats still present versus the 2 on the N54) it's definitely not worth going any other way than N55 + Wireless Kit + Slip ons in Switzerland!
There's my 2 cents! Where do you live in Switzerland? We could meet once if you want to check out my setup! (And I can get you a good price fully installed ;-) )
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