Exhaust manifold to catalytic converter gasket. Porsche 986 Boxster  ❭  99611311300

Exhaust manifold to catalytic converter gasket.
This gasket provides a tight, pressure-resistant seal between the exhaust manifold and the catalytic converter. Under high exhaust temperatures and pulsating exhaust flow, the gasket maintains integrity to prevent leaks, ensures correct back-pressure, and preserves exhaust gas routing as per factory specifications.
Sold each, 2 required per vehicle.

Fits:
Porsche 986 Boxster 2.7L 1999 - 2005
Porsche 986 Boxster S 3.2L 1999 - 2005

Diagram ref no 7

• It is supplied as a single seal; for full exhaust assembly maintenance usually two are required (one per side/exhaust bank) to guarantee symmetric sealing and effective exhaust performance.

• Position: Between the exhaust manifold and catalytic converter - forms the connection seal in the exhaust system.

• Function: Provides a pressure-tight, heat-resistant seal to prevent exhaust leaks, ensure correct exhaust routing, maintain back-pressure, and reduce risk of exhaust-gas leakage or noise.

Over time, high exhaust heat and repeated heating/cooling cycles cause exhaust gaskets to degrade. They may shrink, crack, or lose sealing pressure — which leads to exhaust leaks, rattling, increased emissions, back-pressure loss, poor performance or noisy exhaust. Replacing this gasket restores a secure, leak-free connection and helps maintain engine efficiency, emissions compliance, and exhaust system integrity.

When to replace:
• Audible exhaust leak or ticking / hissing noise at exhaust manifold / cat junction
• Visible soot or carbon deposits around the gasket area (sign of leakage)
• Reduced engine performance, rough idle or inconsistent exhaust tone
• After removing exhaust manifold, catalytic converter or exhaust down-pipe for maintenance or repair
• During a full exhaust system overhaul or gasket-replacement maintenance cycle
•  When original gasket shows signs of age, heat damage, corrosion or physical deformation

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99611311300

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