I have decided after fours years to fit one, I immediately noticed the difference, most importantly it seems to have eradicated the 1800-2000 slow driving hesitation which I am immensely pleased about. I made mine there are many for sale on eBay etc, but I used 1.5mm galvanised steel, I used the link pipe from the EGR valve to make a pattern and I used waxed gasket paper about 0.5mm to make two gaskets. I looked at ones on eBay and then estimated the size of the centre hole, judging by the ones that fit it(x2 6mm) I have put an 8mm hole through the centre, I’ve had no MIL light and all has worked exactly as it should. I guess the smaller the bypass hole the more effective the item will be but, I guess the purpose of the thread is to let anyone else who makes one know that an 8mm hole works fine.

The first pic is the item that you could buy( had I not been so tight walleted)

Very nice work. The restrictors do work and are, in my opinion, a much better option than blanking. And they are legal, unlike blanks. I did a guide on fitting the 4 hole to a 16V mJTD
https://www.fiatforum.com/miscellan...v-mjtd-egr-valve-restrictor-installation.html

Robert G8RPI.