B58 G20 M340i exhaust manifold to turbo gasket 11658669733

Exact-fit gasket for the B58’s exhaust manifold-to-turbo flange on G20 M340i, G21 M340i xDrive, G01 X3 M40i xDrive, G02 X4 M40i xDrive and G29 Z4 M40i.

• Two OEM part numbers: 11658669733 and 11657643149 - both genuine BMW, both in stock
• Fixes boost leaks at the flange: Critical seal for maintaining spool response and preventing hot exhaust gas escape
• Stage 1 or track-day essential: Replace it every time you remove the turbo or manifold - don’t risk a leak on a fast road or track day