R56 N12 N14 N18 Engine .9mm S Head Gasket

R56 N12 / N14 / N18 Engine

9mm “S” Performance Head Gasket

This is not a replacement part. It’s an upgrade decision.

When you step beyond factory power, factory tolerances stop being enough. The SneedSpeed 9mm “S” head gasket is designed for builders who understand that cylinder sealing is not where you cut corners—especially on boosted or high-load MINI engines.

This gasket increases sealing margin where stock gaskets become a liability: heat, pressure, and long-term durability.

Why Builders Trade Up

Factory head gaskets are engineered for factory output. Once boost, compression, or sustained load increases, sealing becomes the weak link. The SneedSpeed 9mm “S” gasket adds thickness and structural integrity to improve clamping stability and resistance to head lift under real-world abuse.

This is the gasket you install before you turn the tune up—not after something fails.

Performance Advantages

• 9mm increased thickness
  Improves sealing tolerance on engines seeing higher cylinder pressures, elevated heat, or previously surfaced heads.

• Stronger, more stable sealing layer
  Designed to hold integrity under boost, track use, and aggressive driving conditions.

• Supports modified and rebuilt engines
  Ideal for engines with upgraded turbos, higher boost targets, or performance internals.

• Direct-fit for R56 platforms
  Compatible with N12, N14, and N18 engines—no modification required.

Ideal Use Cases

• Boosted street builds

• Track and endurance applications

• Engine rebuilds where reliability matters more than saving $40

• Preventative upgrades during top-end service

The SneedSpeed Philosophy

Horsepower is easy to sell.
Reliability is what separates real performance engineering from bolt-on culture.

This head gasket exists to protect the investment you’ve already made in your engine—and the power you’re about to add.