Replaces

2002-2006 Nissan Altima Exhaust Manifold with Catalytic Converter Assembly for L4 2.5L

This part replaces:

  • DORMAN 674-659
  • HOLLANDER 327-59243AB
  • OE # 140029J305
  • OE # 140029J370
  • HOLLANDER 327-59373
  • HOLLANDER 327-59374
  • HOLLANDER 327-50120

  • New

Our aftermarket manifolds are some of the highest quality replacements on the market!

If your vehicle's exhaust is getting loud and the exhaust noise is coming from under the hood or engine then you may need to fix a cracked exhaust manifold. Replacing a broken manifold is easiest with a direct replacement manifold that will fit correctly and bolt up to you original engine and exhaust system. This manifold is a direct fitting replacement.

This steel exhaust manifold with catalytic converter has been designed to eliminate the faults of the original Nissan design. This exhaust manifold has the following specifications:

  • New 1 piece design with new catalytic converter (not reconditioned)
  • Direct replacement
  • Corrosion resistant
  • Replaces original manifolds that are cracked from thermal expansion and contraction
  • Strengthened and redesigned in the vulnerable areas of failure
  • Fits both standard and automatic transmission models
  • Only fits 2.5L vehicles with or without California Emissions

Now you can buy a high quality exhaust manifold with catalytic converter that is built to strict quality control standards for almost less then 1/2 the price at the dealer. REPLACE your broken, warped, or cracked exhaust manifold now with this great fitting, alternative. This exhaust manifold with catalytic converter is a great replacement and has substantial cost savings over a dealer unit.

Emissions Note:

Due to state emissions regulations, we cannot ship this item to the state of California as it is not C.A.R.B ( California Air Research Board) approved for use in this state.

Due to New York state emissions regulations, this item cannot be installed on a California emissions equipped vehicle in the state of New York.

All emissions information for a vehicle can be found on a tag under the hood. If the tag is missing, you can contact a dealership with your VIN to determine which emissions system your vehicle is equipped with.

5 Year Warranty

This item is backed by a 5 Year Warranty. In the event this item should fail during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

  1. Disconnecting the Battery (0:59)
    • Disconnect the negative battery cable with a 10mm socket and ratchet
  2. Removing the Oxygen Sensors (1:10)
    • Disconnect the downstream O2 sensor wiring harness
    • Remove the downstream O2 sensor with an O2 sensor socket
    • If the O2 sensor socket does not work, cut the wires off the O2 sensor
    • Then remove the O2 sensor with a 7/8 inch socket
    • Disconnect the upstream O2 sensor wiring harness
    • Remove the upstream O2 sensor with an O2 sensor socket
  3. Removing the Alternator (3:15)
    • Apply penetrating oil to the four bolts on the catalytic converter heat shield
    • Let the penetrating oil sit
    • Remove the 4 5mm Allen bolts from the engine cover
    • Remove the engine cover
    • Remove the two 10mm bolts from the alternator
    • Disconnect the alternator wiring harness
    • Remove the 12mm bolt from the alternator
    • Attach a 14mm wrench to the serpentine belt tensioner
    • Use the wrench to loosen the belt
    • Pull the serpentine belt off the alternator
    • Release the tensioner
    • Remove the upper of the two 14mm bolts from the alternator
    • Pull off the fuse box cover
    • Remove the 10mm bolt from the fuse box
    • Lift the fuse box and pull it aside
    • Remove the lower of the two 14mm bolts from the alternator
    • Pry out your alternator with a pry bar
  4. Removing the Catalytic Converter (5:47)
    • Remove the four 10mm bolts from the catalytic converter heat shield
    • Lift the heat shield up and off
    • Apply penetrating oil to the five nuts at the top of the catalytic converter
    • Raise and secure the vehicle
    • Apply penetrating oil to the three 14mm nuts at the bottom of the catalytic converter
    • Remove the three 14mm nuts from the bottom of the catalytic converter
    • If the nuts will not come off, break them off with a torch
    • Lower the vehicle to the ground
    • Remove the five 14mm nuts from the top of the catalytic converter
    • Pull the catalytic converter up and off
    • Remove the gasket from the engine head
    • Clean the gasket mounting area with emery cloth or steel wool
  5. Installing the New Catalytic Converter (8:46])
    • Push the new gasket onto the engine head
    • Push the donut gasket into place
    • Put the new catalytic converter into place, lining up the studs
    • Line up the studs at the top of the catalytic converter
    • Start the five 14mm nuts at the top of the catalytic converter by hand
    • Tighten the five 14mm nuts to 45 foot-pounds of torque
  6. Reinstalling the Alternator (10:05)
    • Put the alternator into place
    • Start the lower 14mm bolt into the alternator
    • Insert the upper 14mm bolt into the alternator
    • Tighten the lower 14mm bolt
    • Insert the two 10mm bolts into the alternator
    • Put the alternator bracket into place
    • Connect the alternator wiring harness
    • Reconnect the wire from the battery to the alternator and tighten its nut
    • Move the fuse box into place
    • Insert the 10mm bolt into the fuse box
    • Push on the fuse box cover
    • Attach a 14mm wrench to the belt tensioner
    • Loosen the tensioner
    • Pull the belt onto the alternator
    • Release the tensioner
  7. Reconnecting the Battery (12:03)
    • Reconnect the negative battery cable
  8. Reinstalling the Heat Shield (12:10)
    • Put the catalytic converter heat shield into place
    • Insert the four bolts into the heat shield
  9. Reinstalling the Oxygen Sensors (12:28)
    • Insert the O2 sensors with the O2 sensor socket
    • Connect the O2 Sensor wiring harnesses
    • If you had to cut the old O2 sensors, you will need new ones
    • Put the engine cover into place
    • Insert the four 5mm Allen bolts into the engine cover
  10. Fastening the Catalytic Converter (12:57)
    • Raise and secure the vehicle
    • Start the springs and the 14mm nuts onto the bottom of the Catalytic Converter
    • Tighten the 14mm nuts until they bottom out

Tools needed for replacement:

    Allen Wrenches

  • 5mm Allen Wrench

  • General Tools

  • Floor Jack
  • Jack Stands

  • Pliers, Cutters & misc Wrenches

  • Needle nose pliers
  • Wire Cutters

  • Ratchets & Related

  • 1/2 Inch Breaker Bar
  • A Piece of Pipe (for leverage)
  • Ratchet
  • Socket Extensions
  • Torque Wrench

  • Screwdrivers & Related

  • Flat Blade Screwdriver
  • Pry Bar

  • Sockets - Metric

  • 10mm Socket
  • 11mm Socket
  • 12mm Socket
  • 13mm Socket
  • 14mm Socket

  • Specialty Tools

  • Acetylene torch
  • O2 Sensor Socket

How-to Video:

(13:54 min)

Tools List:

    Allen Wrenches

  • 5mm Allen Wrench

  • General Tools

  • Floor Jack
  • Jack Stands

  • Pliers, Cutters & misc Wrenches

  • Needle nose pliers
  • Wire Cutters

  • Ratchets & Related

  • 1/2 Inch Breaker Bar
  • A Piece of Pipe (for leverage)
  • Ratchet
  • Socket Extensions
  • Torque Wrench

  • Screwdrivers & Related

  • Flat Blade Screwdriver
  • Pry Bar

  • Sockets - Metric

  • 10mm Socket
  • 11mm Socket
  • 12mm Socket
  • 13mm Socket
  • 14mm Socket

  • Specialty Tools

  • Acetylene torch
  • O2 Sensor Socket



This part replaces:

  • DORMAN 674-659
  • HOLLANDER 327-59243AB
  • OE # 140029J305
  • OE # 140029J370
  • HOLLANDER 327-59373
  • HOLLANDER 327-59374
  • HOLLANDER 327-50120

Vehicle Fit

  • 2002-2006 Nissan Altima Exhaust Manifold with Catalytic Converter Assembly for L4 2.5L
  • 2002-2006 Nissan Sentra Exhaust Manifold with Catalytic Converter Assembly for L4 2.5L
$254.95
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List: $522.76 Save: $267.81
Part #: 1AEEM00620

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