What did they change that didn't need replacing and how did you subsequently discover it had been replaced needlessly?
In terms of the "more grunt" as we've said you're looking at exhaust and/or induction mods if you A don't want to spend a s**tload of cash and B just want to make the car sound a bit more manly. If you're worried about hassles with MOT's or lights up on the dash stick to a cat back system rather than a decat. Something like a Yozzasport. There will be clips up in the Clio media and if you search clio 182 + various different exhaust names on youtube too if you want to get an idea of what they sound like.
We're not trying to be rude or belittle you, but at the same time you're a little ambiguous with the request so maybe outline budget, what you're looking to achieve, any concerns you've got about mods you're considering and people will try and direct the answer to tell you what you want to know.
Adding that you're dubious of advice almost implies we can't win either if you're going to receive anything said with a certain amount of distrust.