I've got the ktec super quiet stealth on mine and it is nice and quiet pretty much what I imagine a standard one is like really the exhaust also seems well made and fits wellPut the deposit down on a clio 172 cup today.
Everything seems fine apart form the exhaust is too loud, i couldn't do over 70mph due to the racket, so any suggestions as to what to replace it with, something less lairy and suitable for the motorway.
The problem is the cars mate. A bit of drone is just down to the fact they are thin and very cheap! Sound deadening is poor too. That to me, is why I love mine though!Instead of standard eurocarparts do center section and back for £112, yes they are mild steel so will rust but then so will the originals.
If it lasts a year i'll be happy as it gives me more money to put into the suspension now.
The offbeat noise you describe as being a bit like a 5cyl is pure induction noise and has nothing to do with the exhaust a good induction kit will make the car sound like that even with a standard exhaust Imo the clio sounds best with a standard exhaust and an induction kit all most systems do is add drone but it's all down to personal preference