Parts for your 2005 Toyota Bb-Exhaust mount

2005 Toyota bB Exhaust Mount: What It Does and When to Replace It

Yes, an exhaust mount is absolutely used on the 2005 Toyota bB. Toyota’s technical literature for the bB (NCP3# and early QNC2# series) and the equivalent Scion xB service manuals, along with the Toyota Electronic Parts Catalog, all list multiple “exhaust pipe support insulators” (rubber hangers) and associated brackets along the centre pipe and rear muffler. These components are standard fitment to isolate vibration, keep the exhaust aligned under the car, and allow movement as the system heats and cools.

The exhaust mount on a 2005 Toyota bB has a simple but vital job: suspend the exhaust so it sits at the right height, doesn’t bang on the body or subframes, and doesn’t pass harsh vibrations into the cabin. The rubber insulators act like little shock absorbers, letting the pipework flex as the engine rocks and the system expands with heat. Typically, the bB uses a handful of mounts from the mid-pipe back to the tail, with formed metal hangers on the exhaust sliding through rubber insulators attached to body brackets.

Because they live under the car, these mounts cop road grime, heat, and the odd splash of oil. Over time, the rubber perishes, hardens, or tears. That’s when the symptoms show up:

• Exhaust sits low or looks wonky at the tailpipe.
• Clunks, taps, or buzzing over bumps or at idle.
• Visible cracks or splits in the rubber hangers.

As part of regular servicing, it’s smart to eyeball the bB’s exhaust mounts every 10–15,000 kilometres (or at each service/WOF check). Replacement is straightforward: let the exhaust cool, support the muffler with a jack stand, spray a little silicone or penetrant on the old insulators, lever them off, then slip new, like-for-like insulators on. Check there’s clearance all around—especially near heat shields, the rear beam, and the bumper—then recheck after a week in case the system settles.

For stock cars, quality OEM-spec rubber insulators are ideal. If the bB is lowered or running a heavier aftermarket system, a slightly stiffer polyurethane insulator or an offset/longer hanger can help maintain clearance. Always inspect the metal hanger rods and body brackets too, if they’re bent or rusty, sort that while you’re there. It’s a cheap fix that prevents bigger dramas like cracked welds or a scraped-out muffler.

How many exhaust mounts does a 2005 Toyota bB have?

Most 2005 bB variants use around three to four rubber insulators from the centre section to the rear muffler, depending on engine and market spec. A quick look under the car will show the mid-pipe support and the rear muffler hangers on either side of the tail section.

What are the signs an exhaust mount needs replacing on a bB?

Sagging tailpipe, clunking over bumps, or a rattly idle are the big giveaways. If the rubber looks cracked, perished, or stretched—or if the exhaust is touching a heat shield—that mount’s due. Any oil-soaked rubber should also be replaced, as it breaks down faster.

Can a home mechanic replace the exhaust mounts?

Yes. With the car safely supported, basic hand tools, and some silicone spray, most owners can swap the insulators in under an hour. Support the exhaust so it doesn’t stress other joints, and fit like-for-like parts. If brackets are bent or clearance is tight on a lowered car, a workshop can fine-tune the alignment.