Audi 4.0 TFSI RS6 RS7 S8 upgrade turbochargers kit Stage 2 Upgrade turbochargers kit for Audi RS6, RS7 and S8 with 4G 4.0l TFSI engines. Turbosystems upgrade turbocharger for Audi RS6 RS7 S8 features: -faster spool and bigger power; -both turbochargers equipped with dual ceramic ball bearings; -compressor wheels replaced with bigger reinforced machined from the solid billet -impelers to hold heavy loads on high boost; -enlarged turbine wheels; -refurbished housings; -new shafts and balanced on VSR. Power range: 950+ HP Compatibility list Audi RS6 (C7) 2012-2014 / Engine codes: CRDB; CWUB Audi RS6 (C7) from 2014 / Engine codes: CRDB; CWUB Audi RS6 (C7) Performance from 2014 / Engine codes: CRDB; CWUB Audi RS7 2013-2014 / Engine codes: CRDB; CWUB Audi RS7 from 2014 / Engine codes: CRDB; CWUB Audi RS7 Performance from 2014 / Engine codes: CRDB; CWUB Audi S8 (D4) 2012-2013 / Engine codes: CGTA; CTFA Audi S8 (D4) from 2013 / Engine codes: CGTA; CTFA Audi S8 (D4) Plus from 2013 / Engine codes: CGTA; CTFA