GrimmSpeed 3mm Phenolic Thermal Spacer Subaru WRX 2002-2014 / STI 2004-2021 | 018001

Fitment: This GrimmSpeed thermal spacer fits 2002 - 2014 Subaru WRX, 2004 - 2021 Subaru STI, 2005 - 2009 Subaru Legacy GT, and 2004 - 2013 Subaru Forester XT. Features: Cooler intake air means more horsepower. Raise the intake manifold off the engine with these phenolic spacers to cut intake air temperatures. Unlike others, these use true phenolic material, not cutting - board material. At 3mm thick, they greatly reduce heat transfer from the engine to the intake manifold, preventing heat soak. Cooler intake air is denser, allowing more air to mix with fuel for increased efficiency. Every 5° drop in air temperature boosts power by 1%. They are a direct bolt - on, made in the USA, and sold as a pair. It's recommended to use one OEM intake manifold gasket #14035AA421 on each side of these spacers, available for separate purchase.

Using your GrimmSpeed 3mm Phenolic Thermal Spacer is easy. First, make sure your engine is cool before starting any work. These spacers are a direct bolt - on, so you can simply replace the existing parts with them. When installing, remember to use one OEM intake manifold gasket #14035AA421 on each side of the spacers. You can buy these gaskets separately. As for maintenance, there's not much you need to do. Just keep an eye on the spacers during your regular engine checks. If you notice any signs of wear or damage, it's a good idea to replace them. This will help keep your engine running at its best and ensure you get the most power and efficiency from your Subaru.