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.