Exhaust Repair and Replacement Cost UK: 2026 Price Guide

Your exhaust is one of those parts you forget about entirely — right up until it starts making a racket, stinking out the cabin, or lands you an MOT failure. Then suddenly it's all you can think about.

The frustrating part is that "exhaust repair" can mean anything from a quick weld costing under a hundred quid to a full system replacement pushing past eight hundred. The price depends on which section has failed, what car you drive, and whether your garage reaches for the welder or a brand-new part.

This guide breaks down what you should genuinely expect to pay in 2026, section by section, so you're not walking into a quote blind.

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How Your Exhaust System Actually Works

Before we talk money, it helps to understand what you're paying for. An exhaust system isn't one single pipe — it's made up of several distinct sections, each with its own job and its own price tag.

Exhaust manifold (or header) — bolted directly to the engine, this collects exhaust gases from each cylinder and funnels them into a single pipe. Cast iron or stainless steel, and usually the most expensive section to replace.

Flexi pipe (flex joint) — a short, flexible braided section that absorbs engine movement and vibration. Without it, the rigid pipes would crack from the constant shifting. A common failure point.

Catalytic converter — converts harmful gases (carbon monoxide, hydrocarbons, nitrogen oxides) into less harmful emissions. Contains precious metals, which is why replacement costs are steep and why they're a target for thieves.

Centre section (resonator/middle box) — sits between the catalytic converter and the rear box. Reduces noise and smooths out the exhaust note. Not every car has a separate resonator, but most do.

Rear box (back box/silencer) — the final section at the back of the car. Its main job is noise reduction. This is the part most people picture when they think "exhaust" and it's also the section that rusts through most often.

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Exhaust Repair and Replacement Costs by Section

Here's what you should expect to pay for parts and labour in 2026. These are typical UK garage prices — not main dealer rates, which will be higher.

Exhaust Section	Typical Cost (Parts + Labour)
Flexi pipe repair/replacement	£80–£150
Centre section (resonator)	£100–£200
Rear box (back box)	£80–£180
Catalytic converter	£250–£800+
Exhaust manifold	£200–£500+
Full exhaust system (cat-back)	£300–£800+
Exhaust welding/patch repair	£40–£80

A few notes on these numbers. Catalytic converter costs vary wildly depending on the car — a small petrol cat might be £250 fitted, while a premium or diesel cat can easily push past £600. Manifold replacement is expensive mainly because of labour; accessing it often means removing other engine components.

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How Car Type Affects the Price

Not all exhausts are created equal. The car you drive has a big impact on what you'll pay.

Car Type	Rear Box	Centre Section	Full System
Small car (Fiesta, Corsa, Polo)	£80–£130	£100–£160	£300–£500
Medium car (Golf, Focus, Astra)	£100–£160	£120–£180	£350–£600
Premium (BMW 3 Series, Audi A4, C-Class)	£130–£220	£150–£250	£500–£900+
SUV/Crossover (Qashqai, Tucson)	£110–£180	£130–£220	£400–£700

Diesel adds complexity. If you drive a diesel, you're not just dealing with a standard exhaust — you've also got a diesel particulate filter (DPF) and potentially a more expensive catalytic converter in the mix. A DPF replacement alone can cost £1,000–£2,500, and that's before touching the rest of the system. Check our DPF cleaning cost guide for more on that.

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Common Exhaust Problems

Exhausts fail in predictable ways. Here are the issues garages see most often:

Corrosion and rust holes — the single most common cause of exhaust failure. Short journeys are the worst culprit because the system never gets hot enough to burn off moisture, which accelerates rusting from the inside out. The rear box and centre section are most vulnerable.

Blown gaskets — the gaskets between exhaust sections deteriorate over time. When they go, you get a noticeable exhaust leak with a blowing or hissing sound, especially on cold starts.

Broken or stretched hangers — the rubber mounts that hold your exhaust in place perish and snap. This causes the exhaust to hang lower, rattle against the underside of the car, and eventually stress-crack the pipes.

Flexi pipe cracking — the braided flexible joint hardens and splits with age. You'll hear a distinctive ticking or blowing sound from under the bonnet, often worse when the engine is cold.

Exhaust blowing — a catch-all term for any leak in the system. Could be a pinhole in a pipe, a failed gasket, or a corroded section. The sound is unmistakable — a deep rumble or raspy drone that wasn't there before.

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Signs You Need Exhaust Work

Don't wait for the MOT to tell you. Watch out for these:

• Louder than usual exhaust noise — the most obvious sign. If your car suddenly sounds like it's auditioning for a Fast and Furious sequel, something has let go.
• Rattling or metallic clanking underneath the car, especially over bumps. Usually a broken hanger or a loose heat shield.
• Smell of exhaust fumes inside the cabin — this one is serious. Exhaust gases contain carbon monoxide, which is dangerous. If you can smell fumes inside the car, get it checked immediately. Don't just crack a window and carry on.
• Visible damage — if you can see rust holes, hanging sections, or black soot marks around exhaust joints, it's time.
• Failed emissions at MOT — high CO or hydrocarbon readings often point to an exhaust leak or a failing catalytic converter.
• Reduced fuel economy — an exhaust leak can throw off the oxygen sensors, causing the engine to run rich and burn more fuel.

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MOT Rules for Exhausts

The exhaust is checked at every MOT, and there are several ways it can cause a failure:

• The exhaust must be securely mounted with no part hanging loose or at risk of falling off.
• There must be no leaks from any section. Even a small blow from a gasket joint is a failure.
• The catalytic converter must be present and functioning. Removing it is an MOT failure and illegal on public roads.
• The car must pass the emissions test. For petrol cars, this means acceptable levels of CO and hydrocarbons. For diesels, it's a smoke opacity test.
• Excessive noise from a damaged exhaust can also be flagged.

If your MOT is coming up and you suspect exhaust trouble, it's worth getting it sorted beforehand. A failed MOT means a retest, which means more time off the road. Check your car's MOT status before booking.

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Repair vs Replace: When Patching Is Fine and When It's Not

Not every exhaust problem needs a brand-new part. Here's a rough guide:

A weld or patch is usually fine when:

• There's a single small hole or crack in an otherwise solid section
• The rest of that pipe or box is in decent condition
• The affected area is accessible and not too corroded to hold a weld
• You just need to pass the MOT and the car isn't worth spending heavily on

You should replace the section when:

• The metal is paper-thin and corroded through in multiple places
• A previous repair has already been patched and it's gone again
• The flexi pipe has split — these can't really be welded, they need replacing
• The catalytic converter has failed internally (no amount of welding fixes that)
• You plan to keep the car for several more years and want a lasting fix

A decent garage will be honest about this. If they say it needs replacing, ask them to show you — any reputable mechanic will happily point out the rot.

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Stainless Steel vs Mild Steel Exhausts

When replacing a section, you'll sometimes be offered a choice between mild steel (standard) and stainless steel.

Mild steel is what most cars come with from the factory. It's cheaper, widely available, and does the job. The downside is corrosion — a mild steel exhaust will typically last 5–7 years before rust becomes an issue again, less if you do lots of short trips.

Stainless steel costs roughly 50–100% more upfront but resists corrosion far better. A stainless system can last the lifetime of the car. If you're keeping your vehicle long-term, it's often worth the extra spend. For a rear box, the premium might be £40–£80 more. For a full system, you could be looking at £150–£300 extra.

For most drivers with a car they'll keep another 3–4 years, mild steel is perfectly sensible. If you're planning to run the car into the ground, stainless pays for itself.

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How to Get a Fair Price

Exhaust work is one of those jobs where quotes can vary significantly between garages. A few tips:

• Get at least two quotes. Exhaust specialists (like Kwik Fit or local exhaust centres) are often cheaper than general garages for straightforward replacements.
• Ask whether they're fitting OEM or aftermarket parts. Aftermarket exhausts are usually cheaper and perfectly adequate for most cars.
• Check if the quote includes fitting. Some online prices are parts-only, which can be misleading.
• Don't ignore it. A small exhaust leak will only get worse, and driving with a blowing exhaust can damage the catalytic converter or oxygen sensors — turning a cheap fix into an expensive one.

Need to find a trusted garage near you? Find a local garage through CarOkay and compare prices before you book.

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The Bottom Line

Most exhaust repairs in the UK fall somewhere between £80 and £200 for a single section replacement. Full system jobs are pricier at £300–£800+, but they're relatively rare — usually you're replacing one or two sections, not the lot.

The key is knowing which bit has failed and whether it genuinely needs replacing or just a repair. Armed with the prices in this guide, you'll be in a much stronger position to judge whether that quote is fair.

If your MOT is due and you're worried about the exhaust, check your MOT history first to see if it's been flagged before. And when you're ready to book, find a garage near you to get it sorted without the guesswork.