Ive done it before on my old manifold, seemed to get the exhaust out quicker - it seemed to pop a lot more once the system was really hot. Its really best for curvy long 4:1 manifolds rather than the tight/twisted $:2:1 on the 16v but I dont know how bad other Clios are. The reason why I say this is that the nature of the stuff is that you can get it round most bends but you mustnt overwrap it too much and you mustnt leave any gaps. In practice this is impossible, you will always have either double layers or gaps because of trying to get the wrap around a 3d corner. Then you get hotspots which you dont want.
Example: on the long fast run up the A1M to Doncaster the night before the Donny show (cruising at !10mph on average), I stopped and popped the bonnet to let it cool off while I was in the Little Chef. This was night time. I looked at the manifold and saw some big piece of bright red plastic had somehow got in the engine and melted onto the manifold. Lucky I didnt try and pull it off with my hand cos I looked closer and it was the manifold itself glowing bright red through a gap in the exhaust wrap. On closer inspection, everywhere there was even the tiniest gap had started to glow bright red. Even the downpipe joint and head flange were glowing. Not good really I didnt think! So be careful if youre gonna wrap your exhaust, make sure you get a really tidy wrap and try it on a straighter manifold than mine, gentle curves are OK.
