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Replacement K&N air filter for use with Process West cold air intake kits, compatible with a range of Subaru BRZ, Forester, Impreza/WRX/STI, Legacy/Outback, WRX/STI models.

Process West top-mount intercooler for GC8 Impreza, MY99-00 (GC/GF). Supplied with a correctly sized under-bonnet splitter/shroud matched to the larger core, so the full core face receives ambient airflow. Core dimensions were not specified in the source listing.

This 14mm/12mm head stud kit from RCM uses aircraft-grade S99 steel studs to replace the standard 11mm Subaru head bolts, offering higher tensile strength and clamping force. Source material describes it as suited to higher-output EJ20/22/25 builds.

This 14mm/14mm head stud kit from RCM uses aircraft-grade S99 steel studs to replace the standard 11mm Subaru head bolts, offering higher tensile strength and clamping force. Source material describes it as suited to higher-output EJ20/22/25 builds.

This Extreme 11mm head stud kit from RCM (reference RCM1540) uses aircraft-grade S99 steel studs with a manufacturer-stated tensile strength in excess of 237,000 psi (1640 MPa). Supplied with RCM assembly lubricant. Vehicle fitment needs confirmation.

Project Mu HC+800 rear brake pads for a 2-pot caliper, fitted to the Subaru Impreza (1992-2007). Described by the manufacturer as a dual-purpose ‘cross-over’ compound, rated to withstand temperatures up to 800°C for road and track use.

Project Mu HC+800 front brake pads for a 4-pot caliper, fitted to the Subaru Impreza (1992-2007). Described by the manufacturer as a dual-purpose ‘cross-over’ compound, rated to withstand temperatures up to 800°C for road and track use.

Project Mu NS400 rear brake pads for a 2-pot caliper, fitted to the Subaru Impreza (1992-2007). An asbestos-free compound with low dust and low squeal properties, positioned by the manufacturer for street and performance use.

Project Mu NS400 front brake pads for a 4-pot caliper, fitted to the Subaru Impreza and Legacy, and the Subaru Forester (1996-2007). An asbestos-free compound with low dust and low squeal properties, positioned by the manufacturer for street and performance use.

This 11mm performance head stud kit from RCM replaces the standard cylinder head bolts on Subaru EJ-series engines. Made from S99 steel with a manufacturer-stated minimum yield strength of 1080 MPa, supplied with ARP nuts, washers and RCM assembly lubricant.