Parts for your 2021 Mitsubishi Asx-Exhaust mount

2021 Mitsubishi ASX exhaust mount — what it does and how to look after it

Yes, the 2021 Mitsubishi ASX uses exhaust mounts (also called exhaust mounting insulators or hangers). This isn’t optional hardware — it’s shown clearly in Mitsubishi’s factory information. The Mitsubishi Motors Service Manual for ASX/RVR/Outlander Sport (2019–2021), Group 15 – Exhaust System, includes removal/installation of the muffler and pipe assemblies with references to the exhaust mounting insulators at the centre and rear. Likewise, Mitsubishi’s ASA electronic parts catalogue for the GA-series ASX lists “Insulator, Exhaust Mounting” at multiple positions on the system (commonly referenced part numbers in this family include 1574A091 and 1574A081), confirming their fitment and locations.

On the ASX, these rubber mounts support the weight of the exhaust while isolating vibration so the cabin stays quiet and comfy. They allow a bit of movement for heat expansion and engine rock without letting the pipes knock the body or subframe. When a mount perishes, tears, or goes soft, the exhaust can sag, rattle over bumps, or transmit a droney vibration into the cabin.

As part of regular servicing, it’s smart to get the exhaust mounts eyeballed every 10,000–15,000 km or annually — especially if the ASX sees lots of short trips, coastal air, or unsealed roads. Look for cracked or shiny-melted rubber, elongated holes, or any contact marks on the exhaust or underbody. A quick spray of silicone lube can help slide new mounts on, but don’t use petroleum-based products on the rubber.

Replacement is straightforward on a hoist: safely support the exhaust, pop the old insulators off the pegs, then fit fresh, OE-quality or high-temp equivalents. If one is failed, check the rest — they tend to age together. Aftermarket polyurethane mounts can add firmness for heavy tow or aftermarket systems, but they may pass a bit more vibration, for daily driving, OEM-style rubber keeps things civil.

• Telltale signs on a 2021 ASX: dull thud over bumps, tailpipe sitting low or skewed, buzzing at idle, visible tears in the rubber.
• Good practice: replace in pairs on the same section (centre/rear), ensure the exhaust sits naturally without preload, and never use the exhaust as a jacking point.

Keeping the exhaust mounts healthy helps the ASX avoid rattles, protects flex joints and welds, and preserves that tidy tailpipe alignment.

Popular questions

How often should the 2021 Mitsubishi ASX exhaust mounts be replaced?
There’s no fixed interval in the factory schedule. Instead, have them inspected at each service (about every 10,000–15,000 km or 12 months). Many last 5–10 years, but heat, coastal conditions, gravel roads, or a heavier aftermarket muffler can shorten their life. Replace when there’s cracking, sag, or excessive movement.

What are the symptoms of worn exhaust mounts on a 2021 ASX?
Common giveaways include a clunk or rattle over bumps, the exhaust or tailpipe sitting lower than usual, a buzzy vibration in the cabin at idle, or visible splits in the rubber hangers. If the noise changes when the exhaust is pushed by hand, that’s a strong hint the mounts are past it.

Can polyurethane hangers be used on a 2021 Mitsubishi ASX?
They can, and they’re handy for supporting heavier or performance systems because they deflect less. The trade-off is a touch more vibration transmitted into the cabin. For a stock daily driver, OEM-style rubber mounts generally give the best comfort and noise isolation.