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.
Silverado JBA shorty headers
They are ok. Says to install from the top. I was way easier to do it through the wheel wells. The hardware wasnt that great, i went and bought Grade 8 hardware. Also the spark plug boots that you need to replace dont work well. They are 90 degrees, and they should really be either longer or at a 45 degree so they arent resting directly either on the block or header. Other than that they look and sound nice for the price