dobby 1.9jtd 2003 engine man light comes on ...

[Peter Pick-Up]

Because of the hole in it, not very effective, imo.
Remember, it's not illegal though...

 

[g8rpi]

The Fiat plates have 3 (4 for 16V) smaller holes, not one big one. Theory is that this induces turbulance (swirl) promoting better mixing of the exhaust gases.

There is a thread on the Stilo forum search "Stilo JTD EGR Blanking Plate"

Robert G8RPI.