It frlt a little more responsive but that was more than likely my butt dyno than any real difference.
Sound is nice. I dont think there is too much issue with heat soak, if you run the car and at the end of the journey put your hand down the hole where the bonnet catch is the air there is a lot cooler than in the engine bay.
Noise is a normal induction noise that you get from most exposed filter kits, its nice but not over bearing.
I had the felocity stack mod and a do luck panel filter before. I much prefer the cai kit.
Where abouts in surrey are you. Ill be heading down to oxted in the next couple of weeks if you want to have a listen.