AWE Touring axleback sounds awesome on the ZL1. I’d do the full catback to get rid of the crimped OEM section, and to allow you to run either resonated or non-resonated midpipes, but that’s a personal preference. It’s LOUD without the resonators and the resonators will just “take the edge off”. Many vendors here carry AWE but RDP Store usually runs sale coupons on it for better prices.
https://youtu.be/KHzO25F6JdY