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Product Fitment:
2015-2021 Subaru WRX
The Cometic MLX Head Gasket C4955‑032 is engineered to deliver reliable, high-performance sealing for the right cylinder head of Subaru FA20 engines (such as the 2015–2021 WRX VA). With its multi-layer steel + “stopper” design, this gasket offers excellent durability under boost, thermal cycling, and aggressive tuning.
MLX (Multi-Layer Stopper) design — Combines strength and sealing capability with an internal stopper layer for improved resistance to distortion
0.032″ (≈ 0.81 mm) compressed thickness — Tight tolerance for precise sealing performance
Three-layer steel / laminate construction — Adapts to slight surface irregularities and maintains sealing integrity
No sealants or re-torque required — Simplifies installation and reduces opportunity for error
High thermal and mechanical resistance — Suitable for high-boost, tuned, or motorsport applications
Right-side (RHS) orientation — Must be paired with the left-side counterpart (C4954‑032) to rebuild both heads
| Spec | Value |
|---|---|
| Part Number | C4955‑032 |
| Engine Compatibility | Subaru FA20 (WRX VA / FA20DIT setups) |
| Orientation | Right-hand side (RHS) head |
| Compressed Thickness | 0.032″ |
| Bore Size | 89.5 mm |
| Construction | MLX / Multi-layer steel + stopper |
| Layers | 3 |
| Use Case | Performance, boosted, high-stress / motorsport environments |
Ensure the head and block surfaces are machined to spec (flat, clean, correct tolerances)
Use the correct torque sequence and specification as recommended for your engine
Since the MLX gasket is engineered as “no re‑torque / no extra coating,” avoid applying additional sealants unless explicitly needed
During initial startup and break-in, monitor for leaks, coolant pressures, and temperature consistency
For high boost/tuning builds, re‑inspect sealing after first heat cycles
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