MACE PERFORMANCE MANIFOLD INSULATOR KIT TO SUIT FORD TE50 AU WINDSOR 302 EFI 5.0L V8Exclusive to Mace Engineering, here we have our design registered lower manifold insulators to suit the Ford AU to EL series, fitted with a Windsor EFI 5. 0L 8 cylinder engine. What are manifold insulators and what do they do? Manifold insulators are a thermal insulating spacer that mount between your engine block and intake manifold. Made from a heat blocking composite, our manifold insulators will increase power from your engine by keeping the