GrimmSpeed 3mm Phenolic Thermal Spacer Subaru WRX / STI / Legacy GT / Forester XT 2002-2014

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GrimmSpeed 02-10+ WRX/STi/LGT 3mm Phenolic Thermal Spacer


In case you weren’t aware, the cooler your intake air is the more HP your car will achieve. One way to reduce intake air temperatures is to raise the intake manifold off the engine with GrimmSpeed’s Phenolic Intake-Manifold-to-Engine Thermal Spacer. Phenolic spacers have been used for years by many other specialized automotive companies, but GrimmSpeed is one of the first to offer this technology to the Subaru world.


Phenolic spacers greatly reduces the transfer of heat from engine to intake manifold, which reduces heat soak.

One of a kind true Phenolic material, not cutting board material like others.

Cooler intake temperature = denser air = more power.

Every 5 reduction in temperature increases power by 1%.

Direct OEM replacement.

When running the oem gasket only, your intake manifold gets very hot to the touch, enough to burn your hand. When the oem gasket is replaced with our Phenolic Spacer, your hand can be placed on the intake manifold without any issues.

Made in the USA

Available in both 3mm and 8mm thicknesses.

Applications: 2002-2015 EJ20 / EJ25 models

SKU: 18001

Vendor: GrimmSpeed

Additional information

SKU 18001
Carb Compliance Yes
Prop 65 Unknown
EPA Approved N/A
Weight 0.43 lbs
Dimensions 10.8 × 4.5 × 3.3 in