Vintagespeed

Just a question : I would like to switch to a valve exhaust. The PSE from Porsche is in regulation with the EEC requirements with E-aproval, but it's very expensive. Therefor I would like to buy the DesignTek Valvetronic exhaust, but it comes without E-aproval.

I was just wondering if I keep the stock exhaust tips, would a technical inspector actually notice the DesignTek isn't approved? Is the Original PSE system marqued somewhere with E numbers below, or is it just blank. Does it come with papers?

Thanks!