Clio T 314hp c43 AMG
i know ive read as many threads on turbo 1*2s that i could find on here. I know there has been clios that have had failure from been turbod but theres also been ones that run fine. If i was running a lbt around 6-7psi and the mapping was good i see no reason for the engine not to last long unless i was constantly thrashing it/not looking after it i.e servicing etc/been an idiot and turning the boost up past what people call safe psi on standard internals.
as far as cost is concerned you live and you learn, if you do it for £700 it would be great, but the fact is you should really budget 2k even if your doing the work yourself.