and overall drivability—on both street and track

1982 - 1984       BMW E30       323i

4 low-side auxiliary outputs for meth

flash a bootmod3 Flex Fuel enabled OTS MultiMap or custom tune

More bore / thickness options are available here

B58 Valve Guides 535 and overall drivability—on both streetOur HD bronze valve guides for the BMW B58 engine are engineered for high performance, high boost applications where OEM materials reach their limits. These guides replace the factory BMW valve guides in the cylinder head (intake and exhaust assemblies). Built to withstand elevated temperatures, increased valve spring pressures, and sustained high RPM operation, they deliver exceptional stability and durability under demanding conditions. Machined