GrimmSpeed Phenolic Thermal Manifold Spacers for EJ WRX/STi Competition clutch Designed to work with very

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GrimmSpeed Phenolic Thermal Manifold Spacers for EJ WRX/STi Competition clutch Designed to work with veryThe GrimmSpeed phenolic intake manifold tgv to engine thermal spacers have been designed to absorb the heat that generates between the intake manifold and the engine block to help reduce the heat in your intake manifold. Tests show a 1% increase in horsepower for every 5F of heat reduction. Available in a 3mm or 8mm thickness. Hardware is included with the 8mm set. Vehicle Fitment: 2002 2014 Subaru WRX 2004 2021 Subaru STi Install Notes: GrimmSpeed