Cometic PRO2024C Complete Engine Gasket Kit for 2004-2006 Subaru Impreza / STI

Vehicle Fitment

• 2004-2005 Subaru Impreza WRX STI (EJ257 2.5L DOHC Turbo, AWD)
• 2006 Subaru Impreza WRX STI (EJ257 2.5L DOHC Turbo, AWD)

Fitment Notes

• Engine must be **EJ257** 2.5L Turbo; excludes non-turbo EJ25 variants and other EJ codes. :contentReference[oaicite:0]{index=0}
• Bore size standard is **101 mm** with head gasket thickness .032" MLX; variants exist (e.g. 102mm / .051") under alternate suffixes like PRO2024C-102-051. :contentReference[oaicite:1]{index=1}
• Kit includes *complete engine gasket set* - both top-end and bottom-end gaskets and seals. :contentReference[oaicite:2]{index=2}
• Fitment confirmed through 2006. **2007+ unconfirmed** for factory EJ257 applications. :contentReference[oaicite:3]{index=3}

Features

• Complete engine gasket and seal kit covering the full range of sealing surfaces (head, manifolds, crank seals, oil pan, etc.). :contentReference[oaicite:4]{index=4}
• MLX head gasket base version: standard .032" thickness for 101 mm bore ensures OEM-like compression and reliable sealing under boost. :contentReference[oaicite:5]{index=5}
• Alternate variant option for different bore / thickness (.051" or 102mm bore) for overbore or modified block applications. :contentReference[oaicite:6]{index=6}
• Made with premium materials for high durability under turbocharged thermal & pressure loads. :contentReference[oaicite:7]{index=7}
• Includes complete bottom-end sealing components: front & rear main / crank seals, oil pan, etc. :contentReference[oaicite:8]{index=8}
• Includes all top-end gaskets and seals: head gasket, manifold gaskets, valve cover gaskets, thermostat & water pump seals. :contentReference[oaicite:9]{index=9}
• Manufactured to Cometic's StreetPro / Complete set standards - balancing performance & cost for street, turbo use. :contentReference[oaicite:10]{index=10}
• Exact OEM replacement component coverage for a full rebuild or reseal of EJ257 engine in the 2004-2006 STI models. :contentReference[oaicite:11]{index=11}

Specifications

• Engine: EJ257, 2.5 L DOHC Turbo (4-cylinder), AWD layout. :contentReference[oaicite:12]{index=12}
• Head gasket bore: **101 mm** standard; variant options include ~102 mm with .051" thickness. :contentReference[oaicite:13]{index=13}
• Head gasket thickness (standard): **.032"** MLX in the standard 101 mm version. :contentReference[oaicite:14]{index=14}
• Material: MLX for head gasket; other gasket & seal materials per Cometic's full gasket kit standard (metal, composite, etc.). :contentReference[oaicite:15]{index=15}
• Years covered: 2004 through **2006**; 2007+ unconfirmed. :contentReference[oaicite:16]{index=16}
• All major gaskets/seals included (head, front/rear main seals, oil pan, manifolds, valve cover, thermostat & water pump). :contentReference[oaicite:17]{index=17}

Included Components

• 1x Head Gasket (MLX, 101 mm bore, .032" compressed thickness)
• 1x Front Crankshaft Seal
• 1x Rear Main Seal
• 1x Oil Pan Gasket
• Valve Cover Gasket Set
• Manifold Gaskets (intake & exhaust)
• Water Pump Gasket
• Thermostat Housing Seal
• Spark Plug Tube Seals / Spark Plug Tube Gaskets
• Various small seals/plugs as required for complete engine rebuild (cam ends/plugs etc.)

Product Description

The Cometic PRO2024C Complete Engine Gasket Kit is engineered for the Subaru EJ257 2.5 L Turbo engine in 2004-2006 Impreza WRX STI models. It's a full gasket & seal set, covering all major sealing surfaces - from the head gasket, valve cover, oil pan, crankshaft seals, to manifold and accessory seals. The standard version uses a 101 mm bore head gasket with .032" MLX compressed thickness, matching OEM specifications for many stock or lightly modified EJ257 engines. For overbore or modified block applications, there are variant options (such as 102 mm bore / .051" thickness) to maintain compatibility.

This kit is ideal for full rebuilds or major resealing jobs in the EJ257 used within 2004-2006 Impreza WRX STI. Because it's a complete engine kit, you get everything needed to avoid sourcing multiple separate gaskets and seals. Before installation, verify bore size, head/block mating surface condition, existing gasket specs if replacing, and ensure proper torque and sealing surfaces. Fitment is confirmed through 2006. Use beyond that (e.g. later EJ257 changes, aftermarket big bore blocks) is **unconfirmed**. Proper prep (clean surfaces, torque specs, etc.) is essential for leak-free and long-life sealing.