Parts for your 2006 Subaru Impreza-Exhaust gasket

2006 Subaru Impreza Exhaust Gasket — What it is and when to replace it

Based on the Subaru Factory Service Manual for the 2006MY Impreza (GD/GG) and the Subaru FAST electronic parts catalogue for the same model year, exhaust gaskets are absolutely used on this vehicle. The FSM specifies gaskets at the cylinder head to exhaust manifold and at each pipe joint, noting they must be replaced whenever the joint is disturbed. The parts catalogue lists manifold-to-head gaskets, front pipe and centre/rear joint gaskets (often “donut” or flat ring types), and turbo outlet gaskets on WRX/STI variants. So an exhaust gasket is relevant and fitted on the 2006 Subaru Impreza across both non-turbo and turbo models.

On a 2006 Subaru Impreza, the exhaust gasket’s job is to seal hot gases inside the exhaust, keep noise down, protect occupants from fumes, and make sure the engine and emissions system see the right pressures and sensor readings. On turbo models, tight sealing is even more critical for spool and response. At the engine, Subaru typically uses multi-layer steel gaskets, between pipes you’ll usually find metal/graphite flat or “donut” gaskets designed to flex with heat cycles and movement.

There’s no strict time-based service interval for exhaust gaskets, but they’re considered consumables whenever the system is taken apart. Any time the manifold, front pipe, cat section, or muffler joints are separated, new gaskets should go in. It’s sensible to inspect during major services or around the 100,000 km mark, especially if the car sees coastal conditions, gravel roads, or lots of short trips.

Common signs they’re due: a ticking or chuffing noise on cold start, a whistling sound (often on turbo cars under load), a sooty ring around a joint, exhaust odour near the cabin, and slight drops in economy or performance. A pre-sensor leak can skew O2 readings and trigger fault codes, so it pays to sort it early.

Good practice on replacement includes cleaning mating faces, using quality OEM-equivalent gaskets, and fitting new hardware (studs, nuts, and spring bolts where specified). Don’t smear sealant on Subaru exhaust gaskets unless the manual explicitly calls for it. Align the system so there’s no preload on hangers, snug everything from the front working rearward, and torque to spec. On spring-bolted donut joints, the springs maintain tension—so avoid over-tightening. For DIY, soak fasteners in penetrant ahead of time and use anti-seize sparingly on threads during reassembly. WRX owners should also budget for up-pipe and downpipe gaskets if those sections are being touched.

• Replace gaskets any time joints are opened
• Inspect for soot marks, leaks, or ticking sounds
• Use correct torque and new hardware for a long-lasting seal

FAQ: How often should exhaust gaskets be replaced on a 2006 Impreza?

They don’t have a fixed interval. Replace them whenever the exhaust is disassembled, and inspect at major services. If there’s noise, soot, or odour, treat it as due immediately.

FAQ: What are the symptoms of a leaking exhaust gasket on a WRX versus a non‑turbo Impreza?

Both can tick or chuff at cold start and show soot around joints. WRX models may also whistle under boost, feel lazier to spool, and show a slight loss of punch. Either variant can draw exhaust fumes forward if the leak’s near the front.

FAQ: Is it safe to keep driving with a small exhaust gasket leak?

Short term, it might be drivable, but it’s not ideal. You risk exhaust fumes entering the cabin, incorrect sensor readings, and on turbo cars, reduced performance. Get it sorted promptly to avoid compounding issues.