GrimmSpeed 99+ Impreza 2.5L NA / 00+ Legacy NA 8mm Phenolic Thermal Spacer
In response to the demand to extend our Phenolic Spacer lineup to include some of the older subaru models, we now have created intake manifold thermal spacers for 99+ 2.5 N/A Phase 2 and 99+ 2.2 N/A engines. Thermal spacers lift the intake manifold off the super heated engine to lessen the transfer of heat. Both the intake manifold and engine block are aluminum so the high heat transfers very quickly....well these spacers stop that. The cooler the intake charge the more HP and TQ your engine will make. In addition to cooling your intake charge, these will also give you larger intake volume similar to that of a throttle body spacer.
What it does:
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 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.
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.
Like our other thermal spacers we suggest putting oem subaru gaskets on top and bottom of each spacer to allow proper sealing. You can buy these on our online store as well for much cheaper than the dealership.
This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov