Exhaust Pipe - Rear Section

Procedure for removing and replacing the rear section of the exhaust pipe on a 2005 Dodge Viper 8.3L V10, including disconnection from mid-pipe, hanger removal, and O2 sensor handling.

Warnings

Tools required

Parts

• Rear exhaust section assembly × 1 — Use OEM specification
• Exhaust flange gasket × 1 — Use OEM specification
• Exhaust hanger isolators (if deteriorated) × 2 — Use OEM specification

Preparation

1. Park vehicle on level, solid ground and engage parking brake. Place wheel chocks at front wheels.
2. Allow exhaust system to cool completely (minimum 60 minutes after last engine operation).
3. Apply penetrating oil to all visible exhaust flange bolts and O2 sensor threads. Allow to soak while raising vehicle.
4. Raise rear of vehicle using floor jack at rear differential or manufacturer-specified lift points and support securely on jack stands rated for vehicle weight. Vehicle should be raised high enough to provide comfortable working access underneath.
5. Verify vehicle is stable on jack stands before working underneath.

Procedure

1. 1

   Disconnect rear O2 sensor(s)
   Locate the downstream O2 sensor(s) on the rear exhaust section. Trace the wiring harness from each sensor to its electrical connector and disconnect by pressing the release tab and pulling apart. Note the routing of the wiring harness for reinstallation. Using a 22mm O2 sensor socket or wrench, carefully unthread the O2 sensor(s) from the exhaust pipe. If sensors are difficult to remove, apply additional penetrating oil and allow to soak, then retry with steady pressure to avoid breaking the sensor body.
   ⚠O2 sensors are fragile and expensive. Avoid lateral force or prying that could damage the sensor body or threads. If sensor is seized and breaks during removal, the remaining threads must be extracted from the bung.
2. 2

   Support rear exhaust section
   Position a floor jack with a block of wood or transmission jack beneath the rear muffler section to support its weight. Raise the jack just enough to take up the weight of the rear section without lifting the vehicle. This support will prevent the exhaust from falling when fasteners are removed.
3. 3

   Remove exhaust flange bolts
   Locate the flange connection where the rear exhaust section connects to the mid-pipe section. This flange typically has 2 bolts with spring-loaded hardware. Using a 15mm wrench to hold the nut on the backside and a 15mm socket on the bolt head, loosen and remove both flange bolts. Note the orientation and position of any spring hardware or alignment sleeves for reinstallation. Once bolts are removed, carefully separate the flange connection slightly to relieve tension.
   ⚠Flange bolts may be seized. Apply heat if necessary, but be aware of nearby fuel lines and brake components. Use back-and-forth rocking motion rather than continuous force to break corrosion bond.
4. 4

   Disconnect exhaust hangers
   Locate the rubber exhaust hanger isolators that suspend the rear exhaust section from the chassis. The 2005 Viper rear section typically has 2 hanger points. Using a pry bar, exhaust hanger removal tool, or by hand with steady pulling force, work each rubber isolator off its hanger bracket by stretching the rubber and sliding it off the hook. Work methodically from one side to the other to prevent binding.
   ℹ️Lubricating rubber hangers with soapy water or silicone spray makes removal significantly easier and reduces risk of tearing the rubber.
5. 5

   Remove rear exhaust section
   With flange bolts removed and hangers disconnected, carefully lower the jack supporting the rear exhaust section. Guide the exhaust section down and rearward, clearing the flange connection from the mid-pipe. Maneuver the assembly out from under the vehicle, being mindful of its weight and the clearances around the rear suspension and differential. Once clear, remove the old flange gasket from the mid-pipe connection and inspect the flange faces for damage or warping.
6. 6

   Inspect and prepare mounting points
   With the rear section removed, inspect all exhaust hanger brackets on the chassis for damage, cracks, or excessive rust. Inspect the mid-pipe flange face for warping, cracks, or damaged bolt threads. Use a wire brush to clean the flange mating surface on the mid-pipe, removing all old gasket material, carbon buildup, and corrosion. Ensure the flange face is flat and clean for proper sealing. Inspect rubber hanger isolators and replace any that show cracking, tearing, or excessive softening.
7. 7

   Prepare new/replacement rear exhaust section
   If installing a new rear exhaust section, remove any shipping plugs or protective coatings from O2 sensor bungs. Apply anti-seize compound to the threads of the O2 sensor(s), being careful to avoid getting anti-seize on the sensor tip. Thread the O2 sensor(s) into the new exhaust section by hand until finger-tight. Position a new exhaust flange gasket on the inlet flange of the rear section, ensuring proper orientation.
8. 8

   Install rear exhaust section
   With a helper or using the floor jack for support, lift the rear exhaust section into position under the vehicle. Align the inlet flange of the rear section with the outlet flange of the mid-pipe, ensuring the gasket remains properly seated between the flanges. Maneuver the exhaust hangers into approximate alignment with their chassis mounting brackets. Support the assembly with the jack while proceeding to fastener installation.
   ⚠Do not force flanges together if alignment is poor. Check for interference with suspension components, heat shields, or chassis brackets and adjust positioning as needed.
9. 9

   Install flange bolts and engage hangers
   Apply anti-seize compound to the threads of the flange bolts. Insert both flange bolts through the flanges, ensuring any spring hardware or alignment sleeves are in their correct positions. Thread the nuts onto the bolts and tighten by hand. Do not torque at this stage. Next, engage each rubber hanger isolator onto its chassis bracket hook by stretching the rubber and working it over the hook. Ensure all hangers are fully seated on their brackets.
   Torque spec

   Exhaust Flange Bolt45 Nm (33 lb-ft)
10. 10

    Align exhaust system
    With all hangers engaged and flange bolts hand-tight, verify the exhaust system alignment. Check clearances around the rear muffler section, ensuring adequate clearance from the rear suspension components, differential, chassis rails, and body panels. The exhaust should hang centered and straight with no contact points. Adjust positioning by manipulating the rubber hangers or rotating the entire assembly slightly at the flange connection until proper alignment is achieved.
11. 11

    Torque flange bolts
    Using a torque wrench, tighten the exhaust flange bolts to 45 Nm (33 lb-ft) in a cross pattern if applicable, or evenly if only two bolts. Ensure the wrench is properly calibrated and apply smooth, steady force. After torquing, recheck exhaust alignment to verify that tightening did not shift the assembly out of position.
    Torque spec

    Exhaust Flange Bolt45 Nm (33 lb-ft)
12. 12

    Torque O2 sensors
    Using a torque wrench with the 22mm O2 sensor socket, tighten each O2 sensor to 45 Nm (33 lb-ft). Apply torque smoothly to avoid cross-threading or damaging the sensor. Once torqued, reconnect each O2 sensor electrical connector, ensuring the connector clicks fully into place and is properly seated. Route the wiring harness as noted during removal, securing any clips or retainers to prevent the wiring from contacting hot exhaust components.
13. 13

    Final inspection
    Perform a final visual inspection of all connections. Verify all flange bolts are torqued, all exhaust hangers are engaged, O2 sensor connectors are secured, and the exhaust system has proper clearance from all surrounding components. Check that no tools or parts were left on or around the exhaust system. Lower the vehicle from jack stands and remove support equipment.

Reassembly

1. Reassembly is covered in the procedural steps above, following the removal sequence in reverse.
2. Always use a new flange gasket at the mid-pipe connection.
3. Apply anti-seize compound to all exhaust fastener threads and O2 sensor threads (avoiding sensor tips).
4. Verify exhaust system alignment and clearances before final torquing of flange bolts.

Verification

• Start the engine and listen for exhaust leaks at the flange connection. A leak will produce a distinct ticking or hissing sound that increases with engine RPM.
• With the engine running, carefully feel around the flange connection (from a safe distance) for escaping exhaust gases. Do not touch hot components.
• Rev engine to 2000-3000 RPM and verify no abnormal exhaust sounds, rattles, or vibrations.
• After a brief test drive, re-inspect all connections and verify the exhaust system remains properly aligned with adequate clearances.
• Check for diagnostic trouble codes related to O2 sensors using an OBD-II scanner. Clear any codes that may have set during the repair and verify they do not return.
• Perform a final inspection after 50-100 miles of driving to verify flange bolts remain tight and exhaust hangers have not shifted.

Related trouble codes on this vehicle

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