Does what it needs to
This is my second corsa system. (First was xtreme on my mustang) This system isn't bad. There is the usual helicopter sound going into v4 which I got rid of with a Diablew tune. There is a resonance droneish noise at about 1750 RPM which unfortunately is highway cruising RPM. Talking to Lew (the diablew tuner) to see if I can get cruising rpm at over 2k. TL;DR Helicopter sound going into v4 and resonance sound at ~1750 RPM. Get a tune and that should fix it. Or just muffler+AFM delete.