MACE PERFORMANCE MANIFOLD INSULATOR KIT TO SUIT SAAB 9-4X SIDI LF1 3.0L V6Exclusive to Mace Engineering, here we have our design registered lower manifold insulators to suit Saabvehicles fitted with SIDI LF1 3. 0L V6 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 intake cooler and increase low