the chargepipe from er does not work with the n20 X1, I called Evolution Racewerks to confirm. The only available option right now is Sgear, which is a company based in Taiwan. To answer your last question, n55 chargepipes and n20 chargepipes are not interchangeable... Here is a link to their page.
https://www.facebook.com/SGIL.SGEAR