1997 Nissan Maxima SE with $160 eBay catback ("Watomi Racing") exhaust. Here I revved it in the 2000-5500 rpm range, and only featherd the throttle (anywhere from about 30-60% throttle). IMO it sounds a little funny at WOT, but I think it sounds nice and smooth with around half throttle. But whatever, you be the judge...not bad for so cheap though.