Stage 1, S63 TU4 High Performance Engine: F90 M5, F91, F92, F93 M8, F95 X5M & F96 X6M  produced from 4/2019

***These products are only available to ship to the following states: Alabama, Arkansas, Delaware, District of Columbia, Iowa, Kansas, Louisiana, Maine, Michigan, Mississippi, Montana, Nebraska, New Hampshire, New Mexico, North Dakota, Rhode Island, South Dakota, Vermont, West Virginia, Wyoming. *Note Core charge may apply, Contact us for details. For S63 engines produced from 4/2019 * Note: $10,000 core charge may apply. See below for parameters or contact us for more details. Additional Information Stage 1, S63 TU4 High Performance Engine: F90 M5, F91, F92, F93 M8, F95 X5M & F96 X6M Steve Dinan has been building high performance and racing engines for BMW since 1977, winning 11 racing championships including 3 prototype championships and two 24 Hours of Daytona. The same engine shop that builds the racing engines also builds the street car engines. These talented engineers, machinists, and builders have built hundreds of engines from OEM street rebuilds to full-blown racing engines. From stock, the S63 engine is not designed for a large increase in boost. CarBahn has designed a high-performance engine to handle very high outputs by utilizing higher quality racing Carrillo connecting rods and forged CP pistons. The stock engine compression ratio is relatively high due to the Corporate Average Fuel Economy (CAFE) standards which push for consistently higher fuel economy in cars and trucks. However, this increased compression limits engine performance with higher boost settings by decreasing the size of the fuel-air charge in the combustion chamber, forcing the ignition timing to retard far below MBT (Mean Best Timing, the theoretical optimal ignition timing). Therefore, the Carbahn Autoworks S63 engine has 0.5 less compression to optimize the engine for the increased boost. In an emissions-legal street car, the lowered compression has the added benefit of reducing catalyst inlet temperatures and improved drive-ability on pump gas. Engine core acceptance parameters Must be complete core (factory engine, from oil pan to valve cover) Block must have no: Holes or cracks in casting Holes or crack in covers Bore damage that cannot be honed out Thrust surface damage Journal surfaces damage Bolt hole damage that cant be repaired Heads must have no: Holes or cracks in casting Holes or crack in covers Thrust surface damage Journal surfaces damage Bolt hole damage that cant be repaired Additional repair charges could apply for damaged items that are not normally changed during an overhaul and cannot be repaired or serviced Valves Crankshafts Camshafts Guides ValveTronic mechanism Vanos mechanism FITS 2018-2021 BMW M5 Base Sedan 2019-2021 BMW M5 Competition Sedan 2020 BMW M8 Base Convertible 2020 BMW M8 Competition Convertible 2020 BMW M8 Base Coupe 2020 BMW M8 Competition Coupe 2020 BMW X5 M Competition SAV 2020 BMW X6 M Competition SAV 2020-2021 BMW M8 Base Gran Coupe 2020-2021 BMW M8 Competition Gran Coupe 2020-2023 BMW X5 M Base SAV 2020-2023 BMW X6 M Base SAV