The middle part of the <em>Nissan Almera Classic</em> muffler: do-it-yourself diagnostics, repair and replacement

Nissan Almera Classic is one of the most popular sedans on the aftermarket, but even its reliable exhaust system requires attention over time. The middle part of the muffler (aka resonator or intermediate muffler) often becomes a “weak link”: corrosion, mechanical damage or burning of metal lead to a characteristic hum, vibration and even malfunction of the engine. In this article, we will look at how to independently diagnose the problem, choose a high-quality spare part and replace it without contacting service.

Feature Almera Classic (in bodies N16 And B10) - a compact layout of the exhaust system, where the middle part of the muffler is integrated with the corrugation and fastenings to the body. This simplifies replacement, but requires precise selection of an analogue. We analyzed owner reviews, technical manuals and price lists of car dismantling stations to collect up-to-date information - from signs of malfunction to the nuances of installing new parts.

Signs of a malfunctioning middle part of the muffler

The first signal of problems with the resonator is a change in the exhaust sound. On Almera Classic this manifests itself differently depending on the nature of the damage:

• 🔊 Loud bang when you press the gas sharply - a sign of a burnt-out partition inside the muffler.
• 🚗 Metal clink on uneven surfaces - indicates cracks in the body or disconnection of internal elements.
• 💨 Hissing or whistling at idle speed - indicates depressurization of welds.
• 🔥 Burning smell in the cabin - may indicate exhaust gases entering through cracks in the middle part.

In the later stages of the malfunction, vibrations are added to the body, especially noticeable when driving at speeds of 60–80 km/h. This is due to an imbalance in the system due to the destruction of the internal partitions of the resonator. On Almera Classic with engines QG15DE And QG18DE Ignoring the problem leads to increased load on the catalyst and lambda probes, which can cause an error P0420 (low catalyst efficiency).

⚠️ Attention: If, after starting the engine, white smoke comes from under the car (not to be confused with steam in winter), this may be a sign of coolant entering the exhaust system through a burnt-out cylinder head gasket. In this case, a comprehensive diagnosis is required, and not just replacing the muffler.

The design of the middle part of the muffler Nissan Almera Classic

Middle part of the exhaust system Almera Classic performs two key functions: damping sound vibrations (resonator) and vibration compensation (corrugation). Depending on the year of manufacture and configuration, it may have the following features:

Modification	Middle part type	Material	Features
Almera Classic 1.5 (QG15DE)	Resonator + corrugation	Aluminized steel	The corrugation often burns out due to the short distance to the catalyst
Almera Classic 1.8 (QG18DE)	Resonator with extended body	Stainless steel (original)	More reliable design, but more expensive to replace
Restyling 2008+	Reinforced double-layer corrugation	Stainless steel	Fewer problems with corrosion, but harder to find non-original analogues

On most examples, the middle part is attached to the exhaust pipe and rear muffler via flange connections with bolts M8. The main “disease” is corrosion of welds and corrugations, which is aggravated in winter due to salt reagents. In original parts (Nissan 20520-4M000) stainless steel is used, but even this rarely lasts longer than 100–120 thousand km in Russian conditions.

How to choose a spare part: original vs analogues

When choosing the middle part of the muffler for Almera Classic owners are faced with a dilemma: overpay for the original or take a chance with an inexpensive analogue. Let's look at the pros and cons of each option:

• 🔧 Original parts (Nissan 20520-4M000, 20520-4M001):
• ✅ Guaranteed compatibility and long service life (up to 5 years).
• ✅ Accurate geometry - does not require modifications during installation.
• ❌ Price from 8,000 to 12,000 rubles (for 2026).
• ❌ Often counterfeited - buy only from official dealers.
• 🔧 Analogues from trusted brands:
• 🏆 Bosal (article 099-442) - the best price/quality balance (RUB 4,500–6,000).
• 💰 Walker (article 20520) - 30% cheaper than the original, but lasts 2-3 years.
• ⚠️ Asam And Febi - budget (2,000–3,500 rubles), but often rust after a year.

When purchasing an analogue, be sure to check:

1. Pipe length (must match the original ±2 cm).
2. Flange diameter (standard for Almera Classic - 45 mm).
3. The presence of corrugation (some analogues do not have it, which leads to vibrations).

Step-by-step instructions for replacing the middle part of the muffler

Replacing the resonator with Nissan Almera Classic does not require special tools, but will require an inspection hole or a lift. Average operating time is 1.5–2 hours. Here's what you'll need:

Step 1. Preparation

Drive the car into the pit and process all threaded connections of the middle part of the muffler WD-40 15–20 minutes before work starts. This is especially important for flange bolts, which are prone to sticking. If the bolts are heavily rusted, you will have to cut them off with a grinder (prepare new ones in advance).

Step 2. Dismantling the old part

1. Unscrew the two bolts securing the middle part to the exhaust pipe (engine side).
2. Unclench the clamp connecting the resonator to the rear muffler (it may be necessary to compress it with pliers).
3. Remove the rubber hangers holding the middle part (carefully - they often break).

Step 3. Installing a new part

Before installing the new middle part:

• Clean the exhaust pipe and rear muffler flanges from carbon deposits with a wire brush.
• Apply a thin layer of sealant to the gaskets (not the bolt threads!).
• Make sure that the corrugation of the new part is not twisted - this will shorten its service life.

Tighten the bolts in a cross pattern to avoid flange distortion. Tighten the clamp at the junction with the rear muffler as far as it will go, but without fanaticism - too much compression can deform the pipe.

What to do if the flange bolts are broken?

If the bolts break off, they can be drilled out with a metal drill (Ø6–8 mm), and then a new thread can be cut with a tap M8. An alternative is to use bolts and nuts through the holes in the flange.

Typical replacement mistakes and how to avoid them

Even experienced car owners make mistakes that lead to premature failure of the new muffler. Here are the most common:

⚠️ Attention: Never use silicone based sealant for the exhaust system! When heated, it releases corrosive fumes that destroy oxygen sensors. Only specialized formulations are allowed (for example, Permatex Muffler & Tailpipe Sealer).

• 🔧 Clamp reupholstery — leads to pipe deformation and cracks. Optimal force: the clamp should press the connection tightly, but not press into the metal.
• 🔧 Ignoring gaskets - even if the old gasket looks intact, it needs to be replaced. It costs 100–200 rubles, but it prevents gas leakage.
• 🔧 Incorrect installation of corrugation — if it is located closer to the catalyst than on the original part, the risk of burnout increases by 2 times.
• 🔧 Saving on hangers — rubber hangers become tanned over time. If they are not replaced, vibrations will destroy the welds on the new muffler.

Another common problem is length mismatch between the new and old part. If the pipe turns out to be 3–5 cm shorter, do not try to “stretch” it with an installation tool! Better return to the store and ask for a replacement - forced installation will lead to metal stress and rapid appearance of cracks.

How to extend the life of a new muffler

The middle part of the muffler Almera Classic in Russian conditions it rarely lasts longer than 3–4 years, but a few simple measures will help increase this period:

1. Anti-corrosion treatment: Once a year (before winter), treat welds and corrugation with a product like Molykote or Liqui Moly Unterbodenschutz. Do not use bitumen mastic - it will clog drainage holes.
2. Exhaust system cleaning: After driving through salt reagents, wash the muffler with water (no detergents!). This washes away harsh chemicals.
3. Fastening control: Every 10,000 km, check the tightness of the clamps and the condition of the rubber suspensions. Loose fastenings increase vibrations.
4. Driving style: Avoid idling the engine for long periods of time (especially in winter) - this leads to moisture condensation inside the muffler and accelerated corrosion.

If you often drive off-road, install protective screen under the middle part of the muffler. It can be made from galvanized sheet with a thickness of 1–1.5 mm. This will protect the resonator from impacts from stones and branches.

Cost of service work vs self-repair

Prices for replacing the middle part of the muffler in services vary depending on the region and level of the service station. Below are the approximate prices for Nissan Almera Classic for 2026:

Type of work	Cost (RUB)	Lead time
Replacing the middle part (without removing the system)	1 500–2 500	1–1.5 hours
Replacement with cutting/welding (for rusty bolts)	3 000–4 500	2–3 hours
Anti-corrosion treatment of the exhaust system	800–1 200	30–40 minutes
Exhaust system diagnostics (leak test)	500–1 000	20–30 minutes

Self-replacement will only cost the cost of spare parts and materials (gaskets, sealant). However, if you do not have experience working with the exhaust system, it is better to trust the professionals - installation errors can result in exhaust gases entering the cabin or damage to the catalyst.

Saving on work makes sense if:

• You are confident in the quality of the purchased part (especially important for analogues).
• You have access to an inspection pit or lift.
• You are ready to spend 2-3 hours on dismantling/installation.

FAQ: Frequently asked questions about the middle part of the muffler Nissan Almera Classic

Is it possible to drive with a burnt out middle part of the muffler?

Short-term - yes, but it is fraught with:

• Increased noise (may attract the attention of the traffic police).
• Risk of carbon monoxide poisoning if the crack is near the interior.
• Accelerated wear of the catalyst due to disruption of gas flow.

In practice, most owners operate a car with such a malfunction for 1–2 weeks before replacing it.

What is the difference between the middle part of the muffler on Almera Classic 1.5 and 1.8?

Main differences:

• Length: On 1.8-l versions the resonator is 5–7 cm longer.
• Pipe diameter: U QG18DE the pipes are thicker (48 mm vs 45 mm for 1.5).
• Fastenings: On 1.8 an additional bracket is used to fix the corrugation.

Details not interchangeable! Check the article by VIN code.

How to check the middle part of the muffler for leaks without a hole?

Diagnostic methods:

1. Start the engine and close the exhaust pipe with your hand (for 1-2 seconds). If you feel strong pressure, the seal is broken.
2. Have a helper accelerate while you listen to the sound under the car. A characteristic hiss will indicate a crack.
3. Please note exhaust smell in the cabin - if it appears, it means gases penetrate through the burnt areas.

How long does the middle part of the muffler last on an Almera Classic?

Service life depends on several factors:

Operating conditions	Service life (years)
City, temperate climate, original part	4–6
Suburb, salt reagents in winter, average quality analogue	2–3
Off-road, frequent temperature changes, budget analogue	1–1.5

Record holders among owners Almera Classic they say that original parts on cars with mileage up to 100 thousand km “live” up to 7–8 years with careful use.

Is it possible to repair the middle part of the muffler instead of replacing it?

Yes, but this is a temporary solution. Repair options:

• Welding: Suitable for cracks up to 3-5 cm long. Cost - 1,000-1,500 rubles.
• Bandage: Special repair clamp with asbestos seal (for example, Abro ES-330). Costs 300–500 rubles, lasts 6–12 months.
• Sealant: Only for small holes (up to 1 cm). Before application, the surface must be cleaned to bare metal.

Repair is justified if the part is relatively new (up to 2 years of operation) and the damage is local.