Parts for your 1999 Mitsubishi Lancer-Exhaust gasket

1999 Mitsubishi Lancer exhaust gasket — what it does and when to sort it

Yes, the 1999 Mitsubishi Lancer uses exhaust gaskets. Technical sources including the Mitsubishi Motors Lancer/Mirage CE Workshop Manual (1996–2003) and the Mitsubishi ASA electronic parts catalogue list multiple gaskets in the exhaust system: an exhaust manifold-to-cylinder head gasket, a front pipe “doughnut”/ring gasket at the manifold or catalytic converter join, and flat flange gaskets further down the system. Aftermarket catalogues commonly used in AU/NZ workshops (e.g., Permaseal, Fel-Pro) also specify these gaskets for CE-series Lancers. So an exhaust gasket is absolutely relevant to this model.

On a 1999 Lancer, the exhaust gaskets seal the hot, high-pressure gases as they leave the engine and move through the manifold, front pipe, cat and mufflers. The manifold gasket is typically multi-layer steel to handle heat cycles, while the front pipe often uses a tapered metal/graphite ring that lets the joint flex with engine movement. Downstream flanges can use composite or steel gaskets depending on the section.

They’re not a routine “replace by kilometres” item, but they do wear out from heat, vibration and corrosion, and should be renewed whenever a joint is disturbed. During regular servicing or before a WoF/RWC, a tech should check for soot marks at joins, ticking on cold start, exhaust fumes in the cabin, or a raspy note under load — all classic signs of a leak. A leaking gasket can skew oxygen sensor readings, bump up fuel use, and land the car with an emissions or noise fail.

• Best practice when replacing: always fit new gaskets if a joint is undone, clean mating faces, check flanges for warping, and use the specified spring bolts or studs/nuts where required.
• Avoid generic RTV — most Lancer exhaust joints are designed to seal metal-to-gasket, use sealant only if the workshop manual explicitly calls for it.
• Re-torque fasteners to the workshop spec after a heat cycle if applicable, and inspect hanger rubbers so the system isn’t stressing the joins.
• If the front pipe “doughnut” gasket is crushed or the springs are weak, expect leaks on cold start and replace as a set.

Safety tip: the exhaust gets scorching hot — let it cool fully, support the system properly, and replace any seized or corroded hardware rather than forcing it.

Popular question: Where are the exhaust gaskets on a 1999 Lancer?

They’re typically at the manifold-to-head, the manifold/front pipe or front pipe/catalytic converter “doughnut” joint, and at one or more flange joins further back toward the muffler. Exact count varies with engine and market trim, but the CE Lancer layout commonly has at least two to three gasketed joints.

Popular question: Can it be driven with a leaking exhaust gasket?

Short trips might be possible, but it’s not a great idea. Leaks can let fumes into the cabin, trigger oxygen sensor errors, and increase noise. It’s better to repair promptly to avoid warped flanges or snapped studs from prolonged heat and vibration.

Popular question: Do these gaskets need sealant?

Generally, no. The Lancer’s exhaust gaskets are designed to seal without additional goo. Use new, correct-spec gaskets and torque the hardware properly. Only use sealant if the workshop manual specifically instructs it for a particular joint.