GrimmSpeed Phenolic Thermal Spacer 8mm N/A Subaru - 2.5RS 1998 / Legacy 1996-1999
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 has presented you the answer to this age old problem, raising the intake manifold off the engine with their new real Phenolic Intake Manifold/TGV to Engine Thermal Spacer.
What it does:
How it works:
Temperature Testing Data: Testing at 1/2 hour intervals. All testing was conducted fairly in Fahrenheit measurements on ONE day at a consistent outside temperature.
Test #1 - OEM measurement from IM without spacers, 152 degrees.
Test #2 - with 3mm phenolic spacers the temp dropped to 134 Degrees
Test #3 - With 8mm phenolic spacers the temp dropped to an outstanding 108 Degrees!!!
That is an OVER 44 Degree drop with the largest phenolic spacers!
When installing on the Impreza Phase 1 you will have to cut your EGR tube in half and insert a heater hose between the halves of the EGR tube to extend it.
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