Buy it. Trust me, I've just removed my Evo system to sell and the car, although still great has lost the incredible sound. IMO the standard car sounds pretty rubbish for such an epic vehicle.
The flat spot on cold is even worse, it costs a packet and you have to chop your OEM system...but do it. Best mod I have ever made to not only my Clio but any car except decating a Tuscan. Then on a hoon put your back seats down and the sound is even better and you feel like a racing driver... Providing your imagination is as vivid as mine lol.