Save the cash and put it towards buying a bigger / faster clio.
Dont forget, with these modifications you will need to declare them to the insurance company....
"Hi, is that Admiral, I would like to inform you that i have stripped the interior of my car, fitted a race rollcage, fitted some nice recaro race bucket seats too. Not only will this make me look mint, it will also make my 1.2 Clio more appealing to the TWOC car thief who is more likely to go for a joy ride in my hot hatch racer, Can you tell me how much my insurance will go up please..?"