Ive applied a wrap to a Fiesta ST diffuser and it was ok but did start to shrink around the exhaust cut out section. Cant say whether or not the 197 would do the same. I'd imagine the fins would make for a difficult wrap!
I considered this a couple of years ago. I was put off by the fins, I think they are too deep to be able to get a good finish yourself. Best bet would be to speak to a wrapping company.
Thanks for the replies I have had a quote for £200 would be good to see some pics if anyone knows anyone thats had it done. Only thing putting me off is not sure if they can do it with one sheet of wrap and think it will look rubbish with loads of joins in it!
thats my car on this pictures from miha, the guy who did mine did it great, i dont have any problems with the vinly wraped diffuser, and it also looks cool.