MACE PERFORMANCE PLENUM SPACER TO SUIT HOLDEN SIDI LLT 3.6L V6Exclusive to Mace Engineering is our design registered plenum spacer kit to suit Holden SIDI LLT 3. 6L V6 engines. What is a plenum spacer and what does it do? A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less
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