I can only compare it to stock, as I've never heard the other exhaust setups in person. I would guess that the sound levels are comparable to stock at idle and perhaps a whisp louder at 3k rpm cruising. WOT is hard for me to tell, actually, as i got the VF2 supercharger installed at the same time, and that thing HOWLS!
I am VERY satisfied with it. You won't be disappointed.
2007 Chrome Orange Elise[/B] - Vision Function Stage II supercharger, Larini de-cat, VF single tip exhaust, Propsport gauges, Saikou Michi catch cans, CF front splitter, APR CF rear wing, Production Glassfiber Gullwing Doors, LETSLA shifter upgrade... SOLD October 2010