Handmade GrimmSpeed Phenolic Thermal Spacer 3mm 2002-2014 WRX / 2004-2021 STI / 2005-2009 Legacy GT / 2004-2013 Forester XT / 2005-2009 Outback XT

Description

Improve your Subaru’s performance with the GrimmSpeed Phenolic Thermal Spacer 3mm, designed for 2002-2014 WRX, 2004-2021 WRX STI, and other Subaru models. This premium spacer reduces heat soak by isolating the intake manifold from the hot engine block, delivering cooler, denser air for increased horsepower and efficiency.

Crafted from true phenolic material, this spacer cuts heat transfer by up to 900 times compared to OEM steel gaskets. It lowers intake manifold temperatures significantly—dropping from 152°F to 134°F with the 3mm spacer—helping your engine breathe better under demanding conditions. Compatible with factory or GrimmSpeed gaskets, it’s a direct bolt-on upgrade safe for race fuel, E85, or methanol.

Ideal for Subaru enthusiasts seeking reliable power gains and improved intake temps, this thermal spacer is a must-have for WRX, STI, Forester XT, Legacy GT, and Outback XT owners. Upgrade your intake system today and experience cooler air and optimized engine performance. Shop quality Subaru parts at Subimods.