Intermediate Pipe

Replacement of the intermediate exhaust pipe on a 2008 Dodge Viper 8.4L V10, connecting the catalytic converters to the rear exhaust section.

Warnings

Tools required

Parts

• Intermediate exhaust pipe × 1 — Use OEM specification or aftermarket equivalent
• Exhaust flange gaskets (front connection) × 2 — Use OEM specification
• Exhaust flange gaskets (rear connection) × 1 — Use OEM specification

Preparation

1. Ensure engine and exhaust system are completely cold to the touch
2. Park vehicle on level, solid surface and engage parking brake
3. Place wheel chocks behind rear wheels
4. Raise front and rear of vehicle to provide clearance for exhaust work, supporting on jack stands at manufacturer-specified lift points
5. Spray all exhaust flange bolts and hanger connections with penetrating oil and allow 15-20 minutes soak time

Procedure

1. 1

   Access intermediate pipe from underneath
   Position yourself under the vehicle with adequate clearance. The intermediate pipe runs from the catalytic converters (front) to the rear muffler section. Identify the front flange connections at each catalytic converter outlet and the rear flange connection to the muffler assembly. Locate the rubber exhaust hangers supporting the intermediate pipe along its length.
2. 2

   Remove front flange bolts at catalytic converters
   Using a 15mm socket, remove the flange bolts connecting the intermediate pipe to each catalytic converter outlet. There are 2 bolts per flange connection (4 bolts total for both sides). Support the intermediate pipe with one hand while removing the final bolts to prevent it from dropping. If bolts are severely corroded, apply additional penetrating oil and allow further soak time, or carefully apply heat with a torch if safe to do so.
3. 3

   Remove rear flange bolts at muffler connection
   Using an 18mm socket, remove the flange bolts connecting the rear of the intermediate pipe to the muffler inlet. There are 3 bolts at this connection. Keep track of any spacers or alignment sleeves at this joint. Continue supporting the pipe weight to prevent stress on the hangers.
4. 4

   Disconnect exhaust hangers
   Using an exhaust hanger removal tool or pry bar, carefully separate the rubber exhaust hangers from their mounting brackets. The intermediate pipe is supported by 2 rubber hangers along its length. Apply lubricant to the hanger studs if needed to ease removal. Work methodically to avoid tearing the rubber hangers if they will be reused.
5. 5

   Remove intermediate pipe
   With all fasteners and hangers disconnected, carefully lower and maneuver the intermediate pipe assembly out from under the vehicle. The pipe may require angling and rotation to clear the undercarriage components, transmission crossmember, and driveshaft. Take note of the routing for installation of the new pipe.
6. 6

   Clean flange surfaces
   Using a wire brush and scraper, thoroughly clean the mating surfaces on both catalytic converter outlets and the muffler inlet. Remove all old gasket material, carbon deposits, and corrosion. Inspect the flange surfaces for damage, warping, or cracks. Clean the threads on all flange studs with a wire brush to ensure proper torque during reassembly.
7. 7

   Inspect and prepare new intermediate pipe
   Verify the new intermediate pipe matches the original in length, diameter, flange orientation, and hanger locations. Apply a thin coat of anti-seize compound to all flange bolt threads (avoid getting anti-seize on flange mating surfaces). Place new exhaust gaskets on the catalytic converter outlet flanges and muffler inlet flange.
8. 8

   Position new intermediate pipe
   Maneuver the new intermediate pipe into position under the vehicle, following the routing noted during removal. Align the front flanges with the catalytic converter outlets first, then align the rear flange with the muffler inlet. Do not fully tighten any bolts yet—this is initial positioning only.
9. 9

   Install and hand-tighten flange bolts
   Install all flange bolts at the front catalytic converter connections (4 bolts total) and rear muffler connection (3 bolts total). Thread all bolts by hand first to ensure proper alignment and prevent cross-threading. Hand-tighten all bolts snugly but do not torque yet.
10. 10

    Reconnect exhaust hangers
    Attach the intermediate pipe to the rubber exhaust hangers at their mounting brackets. Use a pry bar or exhaust hanger tool to stretch the rubber hangers onto their studs. Ensure the pipe is properly supported and centered in the exhaust tunnel with adequate clearance from the driveshaft, chassis, and body components.
11. 11

    Torque flange bolts
    Working from front to rear, torque all flange bolts in a cross-pattern to ensure even clamping pressure. Front catalytic converter flange bolts should be torqued to 25 ft-lbs using the 15mm socket. Rear muffler connection flange bolts should be torqued to 35 ft-lbs using the 18mm socket. Double-check all connections are secure.

Reassembly

1. Verify all flange connections are properly torqued and gaskets are seated correctly
2. Confirm exhaust hangers are fully engaged and pipe has adequate clearance from all chassis and driveline components
3. Lower vehicle from jack stands carefully

Verification

• Start engine and allow to idle, listening for exhaust leaks at all flange connections
• Visually inspect all connections for signs of exhaust gas leakage (soot, discoloration, or smoke)
• Rev engine moderately and confirm no unusual exhaust noise or rattling from contact with undercarriage
• After a short test drive, re-check flange bolt torque and verify no new exhaust leaks have developed
• Verify exhaust pipe maintains proper clearance from driveshaft, chassis, and body during suspension articulation

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