Replacing Exhaust Gaskets: When and How
By REMARK Exhaust | Published: 2026-10-23
Category: Tips & Care
Learn how to identify a failing exhaust gasket, when to replace it, and the step-by-step diagnosis to fix an exhaust leak without guesswork.
Quick answer
Replace your exhaust gasket when you hear a ticking or hissing sound at the joint, see black soot around the flange, or notice a drop in exhaust tone quality. A fresh gasket restores the seal and prevents further damage.
Why gaskets fail and why it matters
Exhaust gaskets are crushed between metal flanges to seal the joint. Over time, heat cycles, vibration, and corrosion cause them to lose their ability to seal. A leaking gasket lets exhaust gases escape, which can reduce engine efficiency, create noise, and allow moisture to accelerate rust on the flanges.
Replacing a worn gasket is a low-cost fix that can restore exhaust performance and prevent more expensive repairs later. The key is catching the failure early.
Choosing the right replacement gasket
Not all gaskets are universal. You need the correct size and shape for your exhaust system. REMARK offers specific gaskets for different applications. For example, the 2.5 inch (63.5mm) gasket Type 1 (part number 65C2-S02) fits REMARK Subaru WRX/STI VA and WRX VB axleback systems, while Type 2 (part number 65C2-01) fits REMARK Infiniti Q50/Q60, Nissan 370Z/Z, and FRS/BRZ/86 axlebacks. Always verify your exhaust model and gasket type before ordering.
Using the wrong gasket can cause an immediate leak or damage the flange surface. When in doubt, consult the product drop-down menu or contact REMARK support.
Diagnosis: Is your exhaust gasket failing?
- Symptom: A ticking or hissing sound that gets louder when the engine is cold or under acceleration. You may also notice a faint exhaust smell inside the cabin or see black soot around the pipe joint. Listen for the sound at idle and rev the engine gently to confirm.
- Likely cause: The gasket has compressed, cracked, or burned through due to age, heat, or improper torque during a previous installation. Corrosion on the flange surface can also prevent a proper seal. Inspect the flange for rust or warping; if the metal is damaged, a new gasket alone may not fix the leak.
- Corrective action: Remove the exhaust section, clean both flange faces with a wire brush or sandpaper, and install a new REMARK gasket of the correct type. Tighten the bolts evenly to the manufacturer's torque spec (typically 30-40 ft-lb, but verify for your vehicle). Recheck after a heat cycle. If the leak persists after replacement, the flange may be warped or cracked—consult a professional exhaust shop.
- Stop or choose another option: If the flange is visibly warped, cracked, or rusted through, a new gasket will not create a lasting seal. In that case, consider replacing the exhaust section or having a muffler shop weld a repair patch.
Product facts
- Replacement Exhaust REMARK Gaskets: REMARK exhaust replacement gasket comes in specific types: Type 1 (65C2-S02) for Subaru WRX/STI VA and WRX VB axlebacks, and Type 2 (65C2-01) for Infiniti Q50/Q60, Nissan 370Z/Z, and FRS/BRZ/86 axlebacks. Selecting the correct type ensures a proper seal and avoids the hassle of returning the wrong part.
Replacement Exhaust REMARK Gaskets
