Has it been shuddering during light throttle cruising.....they've replaced the EGR twice and other bits that made no difference?
If so and this started during the warranty, you can argue the fault was present and agreed during warranty, but wasn't diagnosed properly till it ran out.
There is a redesigned cylinder head, but its all a bit secret.
Mine was diagnosed in year 3 but the parts and authorisation came in year 4 as Fiat took a while to authorise then get the parts. The regional manager wanted to see the head opened up before he sanctioned opening the box of the new one and fitting it.
I must say though, I had no quibble and didnt need to fight, it just took a few months and visits while they tried all the cheaper bits first!