Not to sure on the sound difference, they are loud because of my setup. ( kooks shorty headers, mrt Off road h-pipe and borla over axle). It really boils down to personal preference.
I have a like new set of KOOK's I'd trade ya for 'em......if you're interested??
I have an MRT H-Pipe with Hi-Performance cats and Borla over axle pipes with no resonators......most everything I've tried is too loud for my around town driving.....never tried Corsas but would never want the Corsa Extremes...they are LOUD!!
Kinda thought maybe the Corsa Sports might be OK.......they claim NO DRONE....what was your experience??