Subaru OEM Master Gasket Kit (2018+ STI) | 10105AC190

Overview

The Genuine Subaru OEM Master Gasket Kit (Part #10105AC190) is the factory-spec complete gasket set engineered specifically for the 2018+ Subaru WRX STI. Designed for high-performance EJ257 engine rebuilds, this all-inclusive kit ensures a perfect factory seal every time. Whether you're refreshing a built motor or doing a top-end rebuild, this OEM kit eliminates the guesswork of sourcing individual gaskets and guarantees exact fitment right from Subaru.

Key Features & Benefits

• Genuine Subaru OEM Quality — Factory-manufactured to the exact tolerances and material specifications used on the assembly line, ensuring long-term reliability and sealing performance.
• Complete Master Kit — Includes every gasket, seal, and o-ring required for a full engine overhaul, eliminating the need to source individual components separately.
• Exact-Fit Guarantee — Engineered exclusively for the 2018+ WRX STI EJ257 engine; no trimming, adapting, or modification required for installation.
• High-Performance Application — Built to withstand the elevated temperatures, pressures, and boost levels characteristic of the STI's turbocharged EJ257 powerplant.
• Factory Warranty Eligible — As a Genuine Subaru OEM part, this kit is covered under Subaru's OEM parts warranty for added peace of mind.
• Multi-Layer Steel (MLS) Head Gaskets — Where applicable, utilizes the same MLS construction found in factory builds for superior sealing under high-compression and forced-induction conditions.

What's Included

• Head gasket(s)
• Exhaust manifold gasket(s)
• Intake manifold gasket(s)
• Valve cover gasket(s)
• Oil pan gasket
• Coolant and oil seals
• Throttle body and miscellaneous o-rings
• All ancillary engine gaskets required for complete overhaul

Specifications

Fitment & Compatibility

This Genuine Subaru OEM Master Gasket Kit is specifically designed for the following vehicles:

Always verify your vehicle's VIN and engine code before ordering. Part number 10105AC190 applies to 2018+ STI applications — confirm fitment if your vehicle falls outside this range.

Installation

This master gasket kit is intended for experienced engine builders or professional installation by a qualified Subaru technician. A complete engine disassembly is required to replace all gaskets in this kit. Proper torque specifications (per Subaru factory service manual), surface preparation, and coolant/oil refills are essential for a successful rebuild. It is strongly recommended to follow the Subaru EJ257 engine rebuild procedure outlined in the official service manual. Professional installation is advised.