As the title states, I have 18 ZL1 6mt with headers, full exhaust with no valves, and catless. I leave for work very early in the morning and wondering if anyone has had success in modifying the tune to make the car not flare up so much on startup, and not be so loud. After about 10 seconds of running the car is what I would consider acceptable, but before that its a wake up call for anyone within 100 yards of the car.