MACE PERFORMANCE MANIFOLD INSULATOR KIT TO SUIT HOLDEN COMMODORE VE VF SIDI LF1 LFW LFX 3.0L 3.6L V6Exclusive to Mace Engineering, here we have our design registered lower manifold insulator to suit the Holden VE and VF series, fitted with the SIDI LF1 LFW 3. 0L and LFX 3. 6L 6 cylinder engines. 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