S63 Engine Rebuild Kit  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: For S63 engines produced from 4/2019 Additional Information From stock, the S63 engine is not designed for a large increase in boost. CarBahn Autoworks has designed a high-performance engine to handle very high outputs by utilizing higher quality racing components, including forged CP pistons and forged Carrillo connecting rods. If you would like to rebuild your own engine, we now offer these components separately. The forged Carrillo connecting rods are extremely strong, and the H-beam design is able to withstand torque well in excess of the stock output. The stock engines 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 (Maximum Brake Torque, the theoretical optimal ignition timing). Therefore, these CP pistons lower compression by 0.5 (down to 9.5:1 from 10:1) 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. 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 2020-2021 BMW M8 Base Gran Coupe 2020-2021 BMW M8 Competition Gran Coupe Cancer and Reproductive Harm - www.P65Warnings.ca.gov