This B58 Gen 2 Head Gasket is specifically engineered to replace OEM part # 11115WAA04 and # 11127934495 Factory OEM & MLS head gaskets are only engineered to handle a limited amount of cylinder pressures before they start to leak, causing a range of issues, including engine overheating, loss of power, misfires, and in severe cases, catastrophic engine failure. Athena-SCE Cut Ring Head Gaskets are uniquely designed to handle increased cylinder pressure caused by power modifications, making them the recommended choice for applications making 16+ psi. Design: Athena-SCE's gasket body is composed of Motorgasket, a reinforced material developed by Athena's R&D department. This consists of a steel core covered with two layers of asbestos-free aramid fibre and offers excellent thermal and mechanical resistance without compromising its ability to adapt to mating surfaces. To ensure maximum sealing under all conditions, a silicone bead is also applied to critical sealing areas, such as oil and coolant passages. The AISI 304 stainless steel cooper rings bite into the aluminum head, providing maximum sealing around the cylinder bore and optimizing engine performance, even on engines with nitrous and/or turbo applications that exceed 2 bar boost. Please be aware that the gasket should be 0.5mm to 1mm larger than the piston. For example, if the piston measures 84mm, then the gasket should be the next size up, either 84.5mm or 85mm. CR330154, CR330155 Installation instructions: Make sure that the engine block and cylinder head surfaces are clean, flat, and free from any debris, oil, or coolant. Install the Cut Ring gasket on the engine block and ensure that it is properly aligned. Avoid twisting or bending the gasket during installation. Place the cylinder head on top of the gasket and install the head bolts or studs in their correct positions. Follow the manufacturer's recommended torque specifications and tighten the bolts or studs in the proper sequence to ensure even clamping force across the gasket. After the initial tightening, re-torque the head bolts or studs after the engine has been started and then allowed to cool to room temperature. This will ensure that the gasket is properly seated and compressed. It is recommended to not use any additional sealant on the gasket; it is already coated with a silicone bead sealant. Using additional sealant can hinder the performance of the gasket. Notes on Preparation and Installation: Before installation, it is crucial to have the mating surfaces of both the cylinder head and the block professionally cleaned and resurfaced to ensure they are completely flat/straight. It is the responsibility of the engine builder to measure each cooper ring height and verify uniformity across all rings. After initial assembly, it is necessary to allow the engine to complete a full heat cycle, then re-torque your head studs to spec. This means allowing the engine to warm up to its normal operating temperature, remain at operating temperature for several minutes to ensure each component is uniformly heated, then turned off and cooled completely to ambient temperature. BMW B58 Gen 2 Applications: 3 Series 2019-Present G20/G21 M340i / M340i xDrive 4 Series 2020-Present G22/G23/G26 M440i / M440i xDrive Z Series 2019-Present G29 Z4 M40i 5 Series 2020-Present G30/G31 LCI 540i / 540i xDrive 6 Series 2020-Present G32 LCI 640i GT / GT 640i xDrive 7 Series 2019-Present G11/G12 LCI 740i / 740i xDrive X3 Series 2020-Present G01 X3 M40i X4 Series 2020-Present G02 X4 M40i X5 Series 2018-Present G05 X5 xDrive40i X6 Series 2019-Present G06 X6 xDrive40i X7 Series 2018-Present G07 X7 xDrive40i ALPINA B58 Gen 2 Applications: B3 Series 2020-Present G20/G21 B3 B4 Series 2022-Present G22 B4 B5 Series 2020-Present G30 B5 XB7 Series 2020-Present G07 XB7 Toyota B58 Gen 2 Applications: A90 / A91 Supra 2020-Present GR Supra 3.0 2020-Present GR Supra 3.0 Premium 2021-Present GR Supra 3.0 A91 Edition
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