Factory fitment hybrid +4mm Turbo core upgrade to take your S6 S7 A8 to stage 4 power. For more power than +4mm turbos, you need to look at the ball bearing upgrade solution listed here: https://sillyrabbitmotorsport.com/rs7-turbo-upgrade.html
CORES ARE NO LONGER REQUIRED! Please choose the option that best suits your needs
* The S6/S7/A8 CHRA size is the OEM cast wheel compressor to replace blown turbos.
* The RS6/RS7/S8 CHRA size is the OEM billet wheel compressor to upgrade from S6/S7/A8 or to the OEM billet wheel spec.
TSB gaskets, screens, checkvalves + misc hardware to correctly reinstall your new 4.0tfsi turbochargers. These parts must be used (or sourced from your local dealer) when replacing blown turbochargers. The defective parts provided by Audi USA are what caused your turbos to fail.
TSB Bare Essentials kit includes: O-rings, Check valves, screens and screen cover gasket.
***OIL SCREENS MUST BE REMOVED WHEN INSTALLING OUR TURBOS***