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GrimmSpeed Phenolic Thermal Spacer 3mm

Special Order: Quantity of 4 available for arrival here Friday October 22nd 2021 at 11:00AM

This is NOT product that is onroute to us already, it must be ordered from us, once you order, we will order from supplier that has the stock and the availability as listed on the product description.

This displayed ETA is still an estimation. Our supplier(s) have stock we're giving you the regular and typical ETA from that supplier.

If you're ordering a higher quantity then the quantity shown, please email us at with the SKU or direct link and the quantity you're interested and we will confirm lead time.

Do you know what your intake manifold sits on?...a superheated boxer engine. If you don't know already, the cooler your intake air is the more HP your car will achieve.
Grimmspeed Phenolic Intake Manifold/TGV to Engine Thermal Spacers greatly reduce the transfer of heat from your engine to the intake manifold which in turn reduces heat soak. By raising the intake manifold off the engine you create cooler intake temparatures and the air remains denser which leads to more power.


  • Greatly reduces the transer of heat from engine to intake manifold thus reducing heat soak.
  • One of a kind true Phenolic material, not cutting board material like others.
  • The cooler your intake temperature is the denser the air is which leads to more power
  • For every 5 degree reduction in air temperature, increases power by 1%.
  • The cooler and denser the intake air that the engine sucks in, increases the amount of air that can be mixed with fuel thus increasing efficiency.
  • GrimmSpeed 3mm Subaru WRX STI Phenolic Thermal Spacer
  • Direct bolt-on.
  • 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.
  • We have installed both with and without OEM Subaru Gaskets and have had no issues with either way. We do recommend using 2 sets of oem gaskets however, one on both sides of the spacer.
  • USA made
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    Year Make Model Submodel
    2012 Subaru Legacy 2.5 GT
    2011 Subaru Legacy 2.5 GT
    2010 Subaru Legacy 2.5 GT
    2009 Subaru Legacy GT spec.B
    2008 Subaru Legacy GT spec.B
    2007 Subaru Impreza WRX TR
    2007 Subaru Legacy GT spec.B
    2006 Subaru Legacy GT spec.B
    2006 Subaru Baja Turbo
    2005 Subaru Forester XT
    2005 Subaru Impreza WRX
    2005 Subaru Baja Turbo
    2005 Saab 9-2X Aero
    2004 Subaru Forester XT
    2004 Subaru Impreza WRX
    2004 Subaru Impreza WRX STI
    2004 Subaru Baja Turbo
    2003 Subaru Impreza WRX