Parts for your 2018 Lexus Is-Exhaust mount

2018 Lexus IS exhaust mount — what it does and how to look after it

The 2018 Lexus IS absolutely uses exhaust mounts (also called exhaust hangers or insulators). Technical references that confirm this include the Lexus IS Repair Manual for the ASE30/AVE30/GSE30 series on Toyota TIS (Exhaust Pipe section), which details removal/installation using multiple “insulator, exhaust pipe support” rubbers, and the Toyota/Lexus Electronic Parts Catalogue, which lists those insulators and associated brackets across front, centre and rear sections of the system.

On this model, exhaust mounts are small but mighty. They suspend the exhaust under the car, isolate engine and road vibrations, and keep the mufflers and pipework centred in the bumper cut-out. That isolation means fewer rattles in the cabin and less stress on welds, flanges and catalytic converters. By allowing just the right amount of movement, the mounts protect the rest of the exhaust from cracking while helping maintain the Lexus-level NVH the IS is known for.

As part of servicing, it pays to give the mounts a quick check whenever the car’s on a hoist (typically each scheduled service). Look for perished rubber, splits, elongation of the holes, or oil-soaked and hardened insulators. On the 2018 IS there are several mounts along the mid-pipe and rear mufflers, if one is gone, the others are often not far behind.

• Common clues it’s time to replace: a dull thud over bumps, a tailpipe that sits off-centre or too low, a metallic rattle at idle, or the system knocking on heat shields or the rear bumper.
• Good practice: replace mounts in pairs or do the set, and inspect brackets for rust or bent tabs at the same time.

Replacement is a straightforward job for a workshop and a tidy DIY for the confident home mechanic. Let the exhaust cool completely, support it with a stand, and use a spritz of silicone spray to slip old rubbers off the pegs. Fit quality OEM-spec rubber insulators if you want factory refinement, polyurethane options last longer but can transmit more vibration. Bracket fasteners should be tightened to the factory torque values from the Lexus Repair Manual.

In Aussie and Kiwi conditions, many owners see 80,000–120,000 km out of exhaust mounts, but heat, short trips, and exposure to oil can shorten that. They’re inexpensive, quick to fit, and make a big difference to cabin comfort and exhaust longevity—classic small fix, big payoff.

Popular questions about 2018 Lexus IS exhaust mounts

How often should exhaust mounts be replaced on a 2018 Lexus IS?
There isn’t a strict interval—inspect them at every service. Many last 80,000–120,000 km, but frequent short trips, high heat, or oil contamination can age the rubber faster. Replace at the first sign of cracking, sagging, or knocking.

Are polyurethane exhaust mounts a good idea for a Lexus IS?
They’re tougher and can last longer, which is handy for track work or lowered cars. For daily driving, OEM-style rubber usually gives better refinement and fewer vibrations in the cabin. Choose based on your tolerance for NVH versus durability.

Can worn exhaust mounts fail a WOF or roadworthy?
Yes—if the exhaust is insecure, contacting the body, or at risk of detachment, it can lead to a WOF or roadworthy failure. Replacing tired mounts restores proper support and clearance, helping meet inspection standards.