My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Cometic C4578-040 MLS Cylinder Head Gasket for Subaru Bore - EJ25/EJ257 101mm

(1998 Subaru Impreza; 1998 Subaru Forester; 1999 Subaru Legacy)

Manufacturer

Picture for manufacturer Cometic

Part Number

C4578-040
5 reviews
Sale Price

$87.20

Estimated ship date Sunday, November 22

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Cometic C4578-040 is a high-performance Multi-Layer Steel (MLX) cylinder head gasket engineered specifically for Subaru EJ-series boxer engines. With a precision 101mm bore diameter and .040" compressed thickness, this gasket provides exceptional sealing performance for both stock and modified applications.

Engine Compatibility:

  • Subaru EJ25D, EJ251, EJ252 engines
  • Subaru EJ253 and EJ255 Version 1 engines
  • Subaru EJ257 engines (2004-2006)

Key Features:

  • Multi-Layer Steel (MLX) construction for superior strength and durability
  • 101mm bore diameter optimized for EJ25/EJ257 applications
  • .040" (1.02mm) compressed gasket thickness
  • Advanced coating technology ensures optimal sealing under extreme conditions
  • Engineered to handle increased cylinder pressures in boosted applications
  • Precision-manufactured to OEM specifications and tolerances

Cometic's MLX gaskets feature multiple layers of stainless steel with proprietary coatings that accommodate engine movement and thermal expansion while maintaining a reliable combustion seal. This gasket is ideal for engine rebuilds, performance upgrades, or replacing failed OEM gaskets on Subaru's legendary horizontally-opposed engines.

Products specifications

Fits

1998 Subaru Impreza; 1998 Subaru Forester; 1999 Subaru Legacy

Prop 65

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Thank you

First time buyer and couldn't be happier with the service and follow through! Great Job Autoplicity!!!

Great prices and items were shipped very quickly. I will definitely buy from Autoplicity again.

Fast shipping even around the holidays and the cheapest price I could find on my Thule t2 bike rack I would buy here again

very fast shipping..will order again!!!

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy