Hedders detail from Al-Monayz
The best in terms of heat for the headers
3 inches
Detail from Added Power (Al-Safadi)
Fits to Ross 5364 -821-823
LS3 Ross
Also, a special detail for the Z Pipe system, and only a few shops separate it
Fully 3 inches with laser welding, warranty on the welding from Added Power
It comes with original exhaust tips, but its rear pipes are replaced with 3 inches so it can be installed without issues if you want to install it.