Parts for your 1999 Toyota Altezza-Exhaust mount

1999 Toyota Altezza exhaust-mount — what it does, when to replace, and how to keep it sweet

Yes, an exhaust-mount is absolutely used on the 1999 Toyota Altezza (GXE10/SXE10). Toyota’s service literature for the XE10 platform and the Toyota Electronic Parts Catalogue list multiple “Insulator, Exhaust Pipe Support” rubbers and brackets along the front, mid and rear sections of the system. The Lexus IS200/IS300 workshop manual (same platform) details exhaust removal/installation steps that specifically involve detaching and refitting these rubber hangers. So the exhaust-mount is relevant and factory-fitted on this model.

On the 1999 Altezza, the exhaust-mount’s job is to support the exhaust while isolating vibration from the cabin. Those rubber insulators keep the pipes, resonator and muffler sitting at the right height and angle so nothing bangs on the subframe, diff, or rear bumper. They also protect welds, flanges, O2 sensor wiring and the cat from extra stress by allowing a bit of controlled movement as the engine rocks and the system heats and cools.

Because they live under the car copping heat, road grime and the odd splash of salt air, the mounts harden, crack or stretch over time. There’s no strict service interval, but on a car of this vintage it’s smart to inspect them at every service or at least every 20,000 km. Many owners choose to replace them as a set, especially if one has already failed or the exhaust has been upgraded.

• Common signs they’re due: dull thumps on start-up or over bumps, a droopy tailpipe, new vibrations or drone in the cabin, rattles at idle, and visibly perished or torn rubbers.
• Replacement tips: let the exhaust cool, support it with a jack and a block of wood, spritz the hangers with silicone spray, then lever them off with hanger pliers. Refit new rubbers in the same orientation and tighten bracket hardware to the factory spec in the workshop manual.
• Aftermarket choices: OEM-style rubber keeps it quiet and comfy, tougher polyurethane or “locking” hangers can help support heavier cat-back systems but may add a touch of NVH.
• Final checks: make sure there’s even clearance around the subframe, diff and bumper, and that nothing touches on engine rock. Replace any rusty brackets or fasteners while you’re there.

It’s a straightforward DIY for a keen home mechanic—about an hour on stands—or a quick job for any workshop during routine servicing. A fresh set of exhaust-mounts can make the Altezza feel tighter and far less rattly without spending big.

Popular questions

How many exhaust-mounts does a 1999 Altezza have?
Most cars in the XE10 family run several—typically four to six—spaced along the front pipe, centre section and rear muffler. Exact count can vary with trim and whether the exhaust is stock or aftermarket, but you’ll generally find at least two at the rear muffler and one or two supporting the mid-section.

Should they all be replaced at once?
If one mount is split or sagging, the rest are usually not far behind on a car this age. Replacing them as a set keeps the exhaust aligned and prevents chasing fresh knocks from the next weakest rubber. It’s inexpensive peace of mind.

Rubber vs polyurethane hangers—what’s better?
OEM-style rubber gives the best comfort and noise isolation, ideal for a stock daily. Polyurethane or locking hangers are tougher and can hold a heavier cat-back more securely, but may transmit a touch more vibration. Choose based on how the car’s used and your tolerance for NVH.