Parts for your 2004 Subaru Impreza-Exhaust mount

2004 Subaru Impreza Exhaust Mount

Yes, the 2004 Subaru Impreza does use exhaust mounts (rubber hanger bushings). This is confirmed by the Subaru Factory Service Manual for the 2004 Impreza under the Exhaust section, as well as Subaru’s FAST electronic parts catalogue and genuine parts listings, which show multiple rubber hangers supporting the centre pipe and rear muffler on both naturally aspirated and WRX turbo variants.

On this Impreza, the exhaust mounts are the small but mighty rubber isolators that suspend the exhaust from the underbody. They let the system move a touch with engine torque, road bumps, and heat expansion while keeping the pipes and muffler properly aligned. That isolation stops harsh vibration getting into the cabin, prevents the muffler banging the subframe, and reduces stress on flanges, oxygen sensors, and welds.

As part of routine servicing, it’s smart to check these mounts every 20,000–30,000 kilometres or whenever the exhaust is disturbed. Over time the rubber can harden, crack, or stretch, especially with heat and road grime. A tired mount shows up as a droopy tailpipe, a metallic knock over bumps, or a rattle at idle. Left too long, a sagging system can tweak joints and contribute to leaks or broken hangers.

• What to look for: cracked or glossy-hardened rubber, elongated holes, torn edges, or the exhaust sitting off-centre in its recess. Also inspect brackets, heat shields, and nearby bushes for corrosion or looseness.
• Replacement tips: support the exhaust with a jack and block, swap one mount at a time to keep alignment, mist the hangers with silicone spray for easier removal, avoid pre-loading the exhaust when tightening brackets, and check for body clearances after refit. If the car sees rough roads, polyurethane hangers can add support, while OEM rubber keeps NVH closest to factory.
• Good practice: renew any crusty hardware, confirm all clamps and flange fasteners are snug, and recheck the tailpipe clearance once the system is hot after a short drive.

Fresh mounts keep the Impreza feeling tight, cut down on cabin buzz, and protect the rest of the exhaust from fatigue. It’s a low-cost bit of preventative maintenance that pays off in quieter, cleaner running and fewer surprises at the next WOF or rego check.

Popular questions about 2004 Subaru Impreza exhaust mounts

How do you tell if an exhaust mount is worn on a 2004 Subaru Impreza?
Owners usually notice a hollow knock over speed bumps, a buzz at idle, or the tailpipe sitting lower than usual. A quick look underneath will often show a cracked or stretched rubber hanger, or the exhaust touching a heat shield.

If unsure, gently rock the muffler by hand. Excessive movement or metal-to-metal contact points are a giveaway that one or more mounts are past their best.

How often should exhaust mounts be replaced, and should they be rubber or polyurethane?
There’s no strict interval, many last 8–10 years, but heat and road grime can shorten that. Inspect them at each major service and replace at the first signs of cracking or elongation.

OEM-style rubber keeps noise and vibration closest to factory. Polyurethane is firmer and suits rough roads or spirited driving, but may add a touch more exhaust feel in the cabin.

Can they be replaced at home?
Yes, it’s a straightforward DIY with axle stands, silicone spray, and basic hand tools. Support the exhaust, swap one hanger at a time, and double-check clearances before and after a short test drive.

If bolts or brackets are rusty or the exhaust alignment is out, it’s worth letting a workshop handle it to avoid snapped hardware and wasted time.