ARTEC 3.5" Universal Downpipe Fabrication KitSpecifications and Features: Everything you need to make a great 3. 5" downpipe for your turbo setup, just supply your own 3. 5" pipe! Starting with the cast ARTEC G3 3. 5 Inch Turbo Exhaust Outlet Flange, this makes the transition from your G25, G30 or G35 turbo outlet to 3. 5" pipe a breeze. Our cast saddled O2 sensor bung is shaped to perfectly match the curved surface of a 3. 5" pipe so you can place it anywhere you need with ease. With machined