I'm not sure if anyone knows but Solo Performance makes an axelback exhaust for the Non NPP Camaro SS. It is drone free with adjustable J-Pipes to fine tune resonance away from the cabin.
Sound clips can be found on their Facebook page. Just scroll down a few posts and you will see the rear of a Camaro. Also there is a cabin noise video in the comments.
I've searched high and low for exhausts and this one is new and is not on their website as it is being revamped. You will only find this exhaust listed on Ebay and Amazon. Phastek can get them but doesn't have them in stock yet.
Just wanted to let you guys know theres another option out there that I don't think too many are aware of. I have already placed my order with Solo Performance and should be receiving the exhaust next week.
I can post more photos once I get it and additional sound clips. I included the listing photos. I found a few more photos of the item on their Instagram page.
They offer two versions. A stainless tip for $599 and a Black tip for $639.