Hi,
I Won a Scoobyworld Racebox off this Forum back in November 05. I installed it straight away and found the exhaust note much better than my Standard STi Backbox.
The exhaust had a nice powerful sound when driving under boost but remained quiet enough for me to continue using my Hands Free Phone on the move at work.
I remember my initial response to the sound having started the engine straight after the installation was it sounded much the same. However; it's when the car is under boost it becomes very pleasing to the ears. One of the things I like about it too, is the box looks much like a Prodrive Box apart from the polished Stainless Steel which stands out (visually) from the rear when looking towards the car with is shine.
Hope that helps!
Cheers
Lee