MACE PERFORMANCE MANIFOLD INSULATOR TO SUIT HOLDEN COMMODORE VX VU VY ECOTEC L36 3.8L V6Exclusive to Mace Engineering, here we have our design registered lower manifold insulatorto suit the Holden VX and VY series, fitted with an Ecotec L36 3. 8L 6 cylinder engine. What are manifold insulators and what do they do? Manifold insulators are a thermal insulating spacer that mount betweenyour engine block and intake manifold. Made from a heat blocking composite, our manifold insulators will increase power from your engine by keeping the