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Jass Performance EGR Block Off Cap (Exhaust Manifold Side) (Miata/MX5 NA/NB)
This EGR Block Off Cap is a precision-machined component designed to seal the exhaust manifold port after the complete removal of the Exhaust Gas Recirculation (EGR) pipe. The component utilizes a specific sealing geometry to ensure a permanent, pressure-tight seal.
Technical Specifications and Features
Engineered for secure and permanent exhaust-side EGR deletion:
Functional Design and Sealing
- Purpose: Designed for permanent blocking of the exhaust manifold outlet where the EGR pipe connects.
- Sealing Mechanism: Features a specialized cone-vs-cone sealing design and a tight tolerance inner sealing tube. This precision geometry guarantees a reliable, gas-proof seal under extreme exhaust heat and pressure.
- Thread Compatibility: Machined to match the expected thread pitch for a secure, direct fit onto the manifold bung.
- Quality Note: This is a purpose-machined product, not to be confused with generic dome nuts sold for the same purpose.
Material and Construction
- Construction: CNC machined from Stainless Steel for high strength, superior resistance to extreme exhaust temperatures, and long-term corrosion resistance.
- Product Option: Available for purchase as a standalone cap, or as a set that includes the corresponding blanking plate for the intake manifold side.
Fitment and Verification Notes
- Application: Intended for use in scenarios where the EGR system is being permanently deleted (off-road/race use).
- Mandatory Verification: Customers must verify their exhaust manifold type before ordering to confirm a cap is needed. Some specific models (e.g., some USDM 1999–2000 1.8L cars) may require a threaded bung instead of a cap.
| Mazda MX5 Model | |
| NA (MK1) | |
|---|---|
| NB (MK2) | |
| NBFL (MK2.5) | |
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