Resonator

Remove and replace the exhaust resonator assembly on a 2008 Dodge Viper 8.4L V10, requiring vehicle lift and exhaust component removal.

Warnings

Tools required

Parts

• Exhaust resonator assembly × 1 — Use OEM specification or direct-fit aftermarket
• Exhaust flange gaskets × 2 — Use OEM specification
• Exhaust hanger isolators × 1 — Replace if damaged or torn

Preparation

1. Ensure engine and exhaust system are completely cool to the touch
2. Park vehicle on level surface and apply parking brake
3. Place wheel chocks behind rear wheels
4. Raise vehicle on lift or jack stands to provide adequate working clearance underneath
5. Spray all exhaust flange bolts and hanger connection points with penetrating oil and allow 15-20 minutes soak time

Procedure

1. 1

   Locate resonator assembly
   Position yourself under the vehicle on the side corresponding to the resonator being replaced. The 2008 Viper features side-exit exhaust exiting near the rocker/sill area. Verify the exact location and routing of the resonator/muffler assembly against OEM documentation, as it sits downstream of the catalytic converters. Identify the resonator body, inlet flange connection, outlet flange connection, and rubber hanger isolators supporting the assembly. Identify the resonator body, inlet flange connection, outlet flange connection, and rubber hanger isolators supporting the assembly.
2. 2

   Remove inlet flange bolts
   Locate the inlet flange where the resonator connects to the intermediate pipe or catalytic converter. Remove the bolts securing the inlet flange (verify exact count and socket size against OEM documentation for this vehicle). Support the resonator weight with one hand while removing the final bolt to prevent the assembly from dropping. Separate the flange joint and inspect the gasket condition.
3. 3

   Remove outlet flange bolts
   Move to the outlet flange where the resonator connects to the tailpipe section. Remove the bolts securing the outlet flange (verify exact count and socket size against OEM documentation for this vehicle). Keep the resonator supported as you remove the fasteners to maintain control of the component.
4. 4

   Release exhaust hangers
   Identify the rubber hanger isolators supporting the resonator assembly. The resonator is supported by hanger isolators along its length (verify exact hanger count against OEM documentation for this vehicle). Use an exhaust hanger removal tool or pry bar to carefully work the hanger studs out of the rubber isolators. Apply lubricant to the hangers if needed to ease removal. Avoid tearing the rubber isolators unless replacement is planned.
5. 5

   Remove resonator assembly
   With all fasteners and hangers disconnected, carefully lower and remove the resonator assembly from the vehicle. Maneuver the component to clear surrounding chassis members and underbody components. Set the old resonator aside in a safe location.
6. 6

   Clean flange surfaces
   Use a wire brush to thoroughly clean both the inlet and outlet flange surfaces on the remaining exhaust pipes. Remove all old gasket material, carbon buildup, and corrosion to ensure proper sealing with new gaskets. Inspect flange faces for warping or damage that could cause exhaust leaks.
7. 7

   Inspect mounting hardware
   Examine the rubber hanger isolators for tears, deterioration, or excessive wear. Inspect the flange bolts for thread damage or excessive corrosion. Replace any compromised hardware before installing the new resonator. Check that hanger brackets welded to the chassis are secure and not cracked.
8. 8

   Position new resonator
   Install new flange gaskets on both the inlet and outlet connections. Position the new resonator assembly into place, aligning it with the inlet flange first. Insert the hanger studs into their rubber isolators to provide temporary support. Align the outlet flange and verify proper fitment before installing fasteners.
9. 9

   Install inlet flange bolts
   Start both inlet flange bolts by hand to ensure proper thread engagement. Apply a thin coat of high-temperature anti-seize compound to the bolt threads before installation. Note that anti-seize reduces thread friction; if the OEM torque spec assumes dry threads, reduce the target torque accordingly to avoid over-clamping. Tighten the 2 bolts using a 15mm socket in a cross-pattern to evenly seat the flange and gasket. Snug bolts firmly but do not fully torque at this stage to allow for final alignment adjustment.
10. 10

    Install outlet flange bolts
    Start both outlet flange bolts by hand, applying anti-seize compound to threads. Tighten the 2 bolts using a 15mm socket in a cross-pattern. Again, snug firmly but leave final torquing for the next step to permit alignment correction.
11. 11

    Final alignment and torque
    Verify the resonator assembly hangs naturally without binding, twisting, or placing stress on any connections. Ensure adequate clearance exists between the resonator and all chassis components, fuel lines, and brake lines. Once alignment is confirmed, fully tighten all flange bolts to proper torque specification. The exhaust flange bolt torque specification must be verified against the OEM service manual for this vehicle before final tightening. As a general reference only, typical exhaust flange bolts fall in the 20-30 ft-lbs range, but do not rely on this value — confirm the correct spec and tighten in a cross-pattern to evenly load the flanges and prevent leaks.
12. 12

    Verify hanger engagement
    Confirm all hanger studs are fully seated in their rubber isolators and the resonator is properly supported. Apply moderate upward and downward pressure to the resonator to verify hangers hold securely without excessive movement or risk of separation.

Reassembly

1. Reassembly is covered in the installation steps above
2. Ensure all exhaust hangers are fully engaged before lowering vehicle
3. Double-check flange bolt tightness after initial heat cycle

Verification

• Lower vehicle and start engine, allowing it to idle
• Listen carefully for exhaust leaks at both flange connections while engine is running
• Visually inspect both flanges for exhaust gas escaping, which may appear as soot or visible pulsing
• With engine at operating temperature, check for any contact between resonator and chassis components that could cause rattling or heat damage
• Verify no exhaust odor enters the cabin during operation
• After a short test drive, re-inspect flange bolts for proper torque and re-tighten if necessary after heat cycling

More procedures for this vehicle