CSF Radiators BMW B58 Gen2 Thermal Rejection Competition Charge Air Manifold SpacerCSF B58 Thermal Rejection Competition Spacer The Ultimate Heat Barrier The CSF B58 Thermal Rejection Competition Spacer is the ultimate performance upgrade for the B58 Super Manifold (CSF #8200), designed to deliver superior thermal management for track and street use. Made from KIYLEX, a patented, high performance polymer as strong as aluminium and capable of withstanding temperatures up to 1100F, this spacer reduces heat transfer between the intake