If like me you have the TBi version of the 159, you'll no doubt be all too aware of the lack of ground clearance it has.
This was becoming a daily annoyance for me as my journey to work has a section with 4 speed ramps, the 1st of which I have to go over at <10mph to avoid scraping the underside
Then later in the journey the road has a couple of uneven cambers where the bottom of the car hits the ground.
So, I had a look at the undertray and found it is positioned unnecessarily low, with room for up to 40mm extra clearance in places.
I then ordered a sheet of 1.5mm thick aluminium and set about making a replacement. Initially this was easier than expected, but then getting all the holes just right today was a bit of a pain, especially as it was freezing out there!
Haven't tested it over the usual route yet, but have raised the lowest part by around 30-40mm so grounding it should now be a thing of the past
The Alfa one, which is definitely a triumph of form over function has quite an unnecessarily complicated design, whereas mine is not as neat, more function over form - which I'm ok with when it's under the car!
Here's a pic of the (damaged) undertray / The aluminium after initial cutting / all finished and secured