Exhaust system <em>Nissan Note E11</em>: device, diagnostics and modernization

Exhaust system Nissan Note E11 (2006–2013) is a complex unit on which not only acoustic comfort, but also environmental performance, engine dynamics and even fuel consumption depend. Despite its simple design, it is this system that most often becomes the source of problems for owners: from annoying hum to errors P0420 (low catalyst efficiency) on the dashboard. In this article we will analyze the exhaust device Note E11 at the detail level, typical “diseases” for gasoline engines (HR16DE) and diesel (K9K) versions, and also give practical advice on repairs and tuning - without fluff and general phrases.

Feature Note E11 — compact layout of the exhaust system, where each element strictly performs its function. For example, resonator it not only dampens the sound, but also compensates for pulsations from the turbine in diesel versions. And the catalytic converter is integrated into the exhaust pipe, which makes it difficult to replace. We will not talk about “replacement according to regulations” - instead, we will show how to diagnose wear by indirect signs (for example, by the color of carbon deposits on spark plugs) and what cheap analogues of original spare parts really work without loss of resource.

Exhaust system design Nissan Note E11: diagram and purpose of elements

Exhaust system Note E11 consists of 5 key components connected by flanges and clamps. Their location and design depend on the type of engine:

• 🔥 Exhaust manifold - cast iron (gasoline) or steel (diesel), with integrated lambda probe (oxygen sensor). On diesel K9K The turbine is mounted here.
• 🔄 Catalytic converter — in gasoline versions it is built into the exhaust pipe, in diesel versions it is located separately and equipped with a particulate filter (DPF).
• 🔇 Resonator (pre-silencer) — dampens high-frequency vibrations. In diesel Note E11 often has a perforated pipe for better cooling of gases.
• 🔊 Main muffler — two-chamber, with sound-absorbing filler. In versions for Europe it is equipped with an additional resonator.
• 🔧 Fastenings and seals — rubber hangers (4 pcs.) and metal-graphite gaskets between the flanges. The latter often “stick” due to corrosion.

On petrol HR16DE the system is simpler: manifold → catalyst → resonator → muffler. In diesel K9K turbine, particulate filter and valve are added EGR, which affects the exhaust pressure. Important: in Note E11 after 2010, the catalyst is equipped with an additional temperature sensor (sensor 2), which often fails due to overheating.

Typical faults: how to diagnose without a service station

The first sign of exhaust problems Note E11 - change in sound. But there are other “symptoms” that will help more accurately determine the malfunction:

Sign	Probable Cause	How to check
Rumble at idle	Crack in the resonator or burnout of the gasket between the manifold and the catalyst	Visual inspection on a pit or lift. Tap the housing with a metal object - a dull sound will indicate a crack.
Error P0420 or P0430	Clogged or faulty catalyst lambda probe	Check the back pressure with a pressure gauge (norm: up to 0.3 bar at 3000 rpm). Or disconnect the sensor - if the error disappears, the problem is in it.
Black smoke from the chimney	On gasoline engines - rich mixture (malfunction MAF sensor). On diesel engines - clogged DPF or faulty injectors	Treat errors as a scanner. On a diesel engine, check the pressure in the fuel rail (normal: 300–350 bar).
Body vibration during acceleration	Torn or sagging rubber muffler hangers	Rock the muffler by hand - if the play is more than 1 cm, the hangers need to be replaced.

Particular attention to diesel engines Note E11: if after warming up the engine “chokes” at low speeds, the particulate filter is most likely clogged (DPF). You can try to clean it with a special liquid (for example, Liqui Moly Pro-Line Diesel Partikelfilter Reiniger), but if the mileage is over 150 thousand km, it is easier to replace it with an analogue without chip tuning - for example, from Bosal or Eberspächer.

⚠️ Attention: On petrol HR16DE after 2012, the catalyst is equipped with an additional oxygen sensor (sensor 2). If you turn it off or replace the catalyst with a flame arrester, the ECU will put the engine into emergency mode with a speed limit of up to 3000.

Selection of spare parts: original vs analogues

Original exhaust system parts for Nissan Note E11 are produced under the brand Nissan (catalog numbers start with 2050- or 2060-). However, their price is often inflated - for example, an original muffler costs 12–15 thousand rubles, while analogues from Bosal or Walker will cost 4–6 thousand. At the same time, the service life of high-quality analogues is no worse: tests show that mufflers Eberspächer serve 80–100 thousand km even in Russian winter conditions.

Recommended replacement brands:

• 🛡️ Catalysts: Magneti Marelli (article 77012303060 for gasoline), Denso (series DCU for diesel).
• 🔧 Silencers: Bosal (number 264-130), Walker (series Quiet-Flow).
• ⚡ Lambda probes: NGK (NTK 25177) or Denso (DOX-0101). Beware of cheap Chinese sensors - they often give false signals.
• 🔄 Gaskets and clamps: Victor Reinz (set 71-33530-10) or Elring.

For diesel Note E11 with particulate filter (DPF) there is a nuance: if the mileage is more than 200 thousand km, it is better to replace the filter with sports flash suppressor with a pressure sensor simulator (for example, from Sprint Boost). It's cheaper than the original one DPF (about 50 thousand rubles), but will require flashing the ECU to disable errors.

Check the VIN of the car (the exhaust layout depends on this)

Check catalog numbers against ETKA or Nissan Consult>

Check for certificate availability ECE R103 (for catalysts)

Pay attention to the thickness of the metal (optimally 1.5 mm or more)

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Exhaust system repair: step-by-step instructions

Most exhaust repair work Note E11 you can do it yourself with a standard set of tools: socket wrenches for 10, 12 and 14, WD-40 for stuck nuts, and a welding machine (if you need to weld a crack). Let's consider three situations:

1. Replacing the gasket between the manifold and the catalyst

Symptoms: popping sounds when releasing gas, smell of exhaust gases in the cabin.

1. Remove the engine protection (4 x 10 bolts).
2. Unscrew the clamp connecting the catalyst to the resonator (key 14).
3. Disconnect lambda probe (the connector usually sticks - spray with WD-40).
4. Remove the two manifold flange bolts (12mm wrench). Replace the gasket with a new one (Victor Reinz 71-33530-10).
5. Reassemble in reverse order, first cleaning the flanges from carbon deposits with a wire brush.

2. Repairing a crack in the resonator

If the crack is small (up to 2 cm), it can be welded using a semi-automatic wire welder ER70S-6. To do this:

1. Clean the crack area with a grinder to bare metal.
2. Drill 3mm holes around the edges of the crack (to prevent spreading).
3. Weld the seam using short stitches, allowing the metal to cool.
4. Treat the seam with heat-resistant paint (for example, Bosny Paint).

⚠️ Attention: Do not use cold welding or epoxy resins to repair the exhaust - they cannot withstand temperatures above 200°C and will quickly fall off. Exception: special sealants for exhaust systems (e.g. Permatex Muffler & Tailpipe Sealer).

3. Replacing the catalyst with a flame arrester (only for gasoline versions!)

If the catalyst is clogged and the budget is limited, you can install a flame arrester with blende lambda probe. You will need:

• Universal flame arrester (for example, MG-Race 55mm).
• Deception lambda probe (mechanical or electronic).
• Angle grinder for cutting pipes.

Process:

1. Cut out the catalyst, leaving 5 cm of pipe on each side for welding.
2. Insert the flame arrester and weld it.
3. Install the snag into the connector of the second lambda probe (after the catalyst).
4. Clear errors with the scanner (for example, ELM327).

Tuning the exhaust system: what will replacing it with a straight-through exhaust system give?

Many owners Note E11 consider exhaust tuning as a way to improve dynamics and sound. However, the effect depends greatly on the type of engine:

• 🔥 Gasoline HR16DE: Replacing the catalyst with a flame arrester + installing a “forward flow” (for example, Remus or Sprint) gives an increase of up to 5–7 hp. by reducing back pressure. But the sound becomes louder (85-90 dB), which may not pass inspection.
• 💨 Diesel K9K: Tuning the exhaust here is almost pointless - the increase in power is minimal (1–3 hp), and the removal DPF requires mandatory ECU flashing (cost: 10–15 thousand rubles).

If you still decide to modify, pay attention to:

• 🔊 Noise level: In Russia the permissible limit is 96 dB. Most “straight flow” systems produce 90–95 dB, but after a year of operation the sound becomes louder due to burnout of the filler.
• 🔧 Material: Optimally – stainless steel AISI 409 (cheaper) or AISI 304 (more expensive, but lasts longer).
• 📉 ECU firmware: Without it, after removing the catalyst, the engine will “stupid” due to incorrect readings lambda probes.

An example of successful tuning for HR16DE:

• Flame arrestor instead of catalyst (MG-Race).
• Resonator Sprint Boost with perforated pipe.
• Muffler Remus with adjustable sound (optional valve control).
• Firmware Stage 1 from Dimsport (cost: ~20 thousand rubles).

Result: +10 hp, improved gas pedal response and a “sporty” sound without hoarseness.

💡

Diesel exhaust tuning Note E11 justified only with complex chip tuning (replacement of turbine, injectors, etc.). Replacing the exhaust itself will have minimal effect.

Maintenance: How to Extend the Life of Your Exhaust System

Exhaust system life Nissan Note E11 depends not only on the quality of spare parts, but also on operating conditions. Here are some practical tips:

1. Washing in winter: After driving through salt reagents, be sure to wash the underbody and exhaust pipe with warm water. Salt corrodes welds and rubber hangers.
2. Warming up the engine: In cold weather, let the engine idle for 2-3 minutes so that the condensation in the muffler evaporates. This will prevent corrosion from the inside.
3. Gimbal control: Every 20 thousand km, check the condition of the rubber suspensions. If they are cracked, replace them (set cost: ~500 rubles).
4. Sensor diagnostics: Check readings once a year lambda probes scanner. If the voltage on the sensor is below 0.1V or above 0.9V, it is faulty.

For diesel Note E11 It is especially important to monitor the condition of the particulate filter (DPF). To extend its life:

• 🚗 Avoid short trips (less than 10 km) - the filter does not have time to burn out.
• 🛢️ Use low sulfur content fuel (Euro 5 or Euro 6).
• 🔥 Once every 3 months, “burn through” the filter: 20 minutes of driving at a speed of 2500–3000.

⚠️ Attention: If the icon on the dashboard lights up DPF (yellow filter), don't ignore it! Further operation will lead to complete clogging of the filter and damage to the turbine (repairs will cost 80–100 thousand rubles).

FAQ: Frequently asked questions about the exhaust system Nissan Note E11

Is it possible to drive a gasoline car without a catalyst? Note E11?

Technically yes, but with caveats:

• Without flashing the ECU, the engine will go into emergency mode (limited speed to 3000).
• The noise level will increase to 95–100 dB (you will not pass inspection).
• The exhaust will become more toxic (does not correspond Euro 4).

The optimal solution is to replace the catalyst with a flame arrester with blende lambda probe.

How often should the muffler be replaced? Note E11?

The service life of the original muffler is 100–150 thousand km. The resource is affected by:

• Metal quality (the original is 1.2 mm steel, cheap analogues are 0.8 mm).
• Operating conditions (winter salt reduces the life by 30–40%).
• Driving style (frequent gas changes accelerate burnout of the filler).

Signs of wear: rust on the seams, dull sound when tapping, condensation from the pipe.

What to do if a whistle appears after replacing the resonator?

Whistling is usually caused by:

1. Loose connection of flanges (check the gasket and tightness of the clamps).
2. A breakdown in the weld (the part needs to be welded or replaced).
3. Air entering through a crack in the corrugation (replace the corrugation with a new one).

If the whistle appears at high speeds, the problem may be a burnt-out resonator partition.

Is it possible to clean the catalyst? Note E11 without removal?

No, effective cleaning is only possible after dismantling. “Folk” methods (for example, filling Mole into the gas tank) do not work and may damage lambda probes. To clean:

1. Remove the catalyst.
2. Soak it in a solution of citric acid (100 g per 1 liter of water) for 12 hours.
3. Rinse with pressurized water.
4. Blow with compressed air and dry.

The effectiveness of the method is 30–50%. If the honeycombs are very clogged, cleaning will not help.

Which muffler is best for Nissan Note E11: original or analogue?

The choice depends on your budget and goals:

Criterion	Original	Analogue (Bosal/Eberspächer)
Service life	150–200 thousand km	80–120 thousand km
Price	12–15 thousand rubles	4–7 thousand rubles
Sound	Quiet, meets factory specifications	Can be a little louder (2-3 dB)
Warranty	12 months	6–12 months

A high-quality analogue is suitable for daily use. The original is justified if you plan to sell the car or drive off-road (the metal thickness is higher).