CSF BMW B58 Thermal Rejection Competition Spacer for CSF8200/CSF8200CThe CSF B58 Thermal Rejection Competition Spacer is the next level upgrade for the B58 Super Manifold (CSF #8200). Made from KIYLEX, This thermal barrier reduces manifold temps lowering IATs, improves efficiency, and combats heat soak. Made from KIYLEX A patented revolutionary high performance final stage polymer Spacer Height = 6. 5mm Acts as a thermal barrier that dissipates heat between the cylinder head and intake manifold Proven to lower intake