Grimmspeed Phenolic Manifold Spacers 3mm PAIRDo 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. We present you the answer to this age old problem, raising the intake manifold off the engine with GrimmSpeed's Phenolic Intake Manifold TGV to Engine Thermal Spacer. Phenolic spacers have been used for years by many other specialized automotive companies, but this is new technology to