http://www.cliosport.net/forum/search.php?searchid=2513435
The short of it is that for a RS clio (sorry, don't know if you mean a "clio sport" as in the 1.2s, 1.4s etc or a proper RenaultSport Clio 172/182/197/200) the standard airbox setup produces better overall air flow than any cone filter. Whilst cone filters
may move a bigger volume of air they will suffer from heatsoak negating the advantage (if any!)
There are only 2 "induction kits" that have been proven to increase power, namely the JMS IK (consisting of a few bits, the airbox from the V6 engine, a panel filter, samco hosing etc) and a second one which eludes my mind completely right now!
If it's purely noise you want, there is a really easy little trick to bypass the "accoustic valve" (which is basically there to make the standard induction nice and quiet) which gives a nice induction noise and is absolutely free. There are a few threads with some handy pics, maybe even a guide. Just search "accoustic valve."