I have the 3" Race with Res and No Downpipe (as of now) Sound is pretty decent, about 15% over stock but is much deeper. Not much happens in low revs, just a nice deep grumble but once you it 4k-7k it comes alive, but it not the sound of a non res - its more deeper and powerful sounding if you no what i mean, its not wharpy and ricey.
Well in that case it sounds exactly what I'm after. Cheers