I have the remus race. Up until recently it was a very nice deep mellow tone. Not too loud. Nice rumble on the low end and not much of an increase in volume towards the top end. Got lots of confidence. This past weekend I cut out the front cats. The car "woke up" and the muffler still sounds great. I'm keeping my secondary cats but might kill my rear resonators... they really muffle the sound at the low end and I'd like that low end deep tone to come out even more at better volume.
Hope this helps.