Your the first person to ever think XS Power stuff is good. It's all cheap tosh
It's probably because I've actually used the product and had my car mapped to suit, as apposed to sacking them off because of internet here-say. As I say, it isn't on a Clio but all the same the product itself is brilliant.
Have a GOOD search on google for 1.8t XS power manifolds before replying with a "they're s**t" post, I am not the only person who says otherwise.
In terms of reliability, the one in the video above is the original V1 manifold and is over 4 years old. You can see how hot it gets, and it's not cracked yet. That turbo and manifold has been on three of my friends cars and has made 338bhp across two reliable rollers, which is unheard of for a K04 hybrid (don't know how familiar you are with K04's). Similar setups have struggled to give 320bhp, the only variable has been the manifold.
I may have just been lucky, in that every XS product has used has been great. I've had a friend or two who have had issues, but for the price of them I don't think anybody would complain given the power gains on the applications I've seen.
I don't want to rub anybody up the wrong way, and I'm sorry if I have. But they are a good product.
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Have a graph of an S3 with a standard K04, before the V2 1.8t K04 manifold came out it was unheard of to see more than 285bhp out of a K04 and due to them being small it was always a spike that tailed off.
This is a log that a tuner I know put up on facebook this morning, after his first mapping play with the new manifold. The load maps have shown 270bhp for the same readings on a THS cast hi-flow manifold.
And they look stunning!