exhaust

Flex Pipe

for 2002 Dodge Viper 8.0L V10 · RWD

Difficulty

Moderate

Time

1.8 h

Tools

Steps

✓Fact-checked. Built from OLP's spec database, then independently fact-checked line by line with every correction applied. Master-tech sign-off by Chris Hackleman is queued. Cross-check torque values against the factory manual, and stop if anything looks unsafe. How our data is made.

Replace the exhaust flex pipe on a 1992 Dodge Viper 8.0L V10, including disconnection from exhaust flanges, removal of damaged flex section, and installation of new flex pipe with proper torque specifications.

Warnings

⚠️Allow exhaust system to cool completely before beginning work. Exhaust components can remain hot for over an hour after engine shutdown and cause severe burns.

⚠The Viper's side-exit exhaust runs close to body panels and rocker sills. Use care when maneuvering tools and components to avoid damage to vehicle finish.

⚠Exhaust fasteners may be severely corroded. Apply penetrating oil 15-30 minutes before attempting removal. Be prepared to cut fasteners if necessary.

ℹ️The flex pipe allows for exhaust expansion and engine movement. Ensure replacement flex pipe has proper flexibility and length to prevent stress on exhaust hangers and manifold connections.

Tools required

Floor jack and jack stands (min 3-ton capacity)Essential

Wheel chocksEssential

3/8" and 1/2" drive ratchetsEssential

3/8" and 1/2" drive socket set (metric)Essential

15mm wrench (flare-nut or box-end)Essential

Torque wrench (20-70 Nm / 15-50 lb-ft range)Essential

Penetrating oilEssential

Wire brush

Anti-seize compoundEssential

Safety glassesEssential

Work gloves (heat-resistant)Essential

Exhaust hanger removal tool or pry bar

Reciprocating saw or cutoff tool (if flex pipe is seized)

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Parts

Exhaust flex pipe assembly × 1 — Use OEM specification or Walker 50207
Exhaust flange gaskets × 2 — Use OEM specification
Exhaust hanger isolators (if damaged) × 1 — Use OEM specification

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Preparation

Ensure vehicle is on level ground and engine/exhaust system is completely cool to the touch
Place wheel chocks behind rear wheels
Raise front of vehicle using floor jack at designated jacking points and support securely on jack stands at manufacturer-specified locations
Spray all exhaust flange bolts and clamp hardware with penetrating oil and allow to soak for 15-30 minutes
Visually inspect exhaust system to identify flex pipe location (typically between catalytic converters and rear exhaust section on Viper side-exit exhaust)
Verify replacement flex pipe matches original in diameter, length, and flange configuration

Procedure

1
Disconnect oxygen sensor wiring
If equipped, locate the oxygen sensor(s) near the flex pipe section. Trace the wiring harness to the electrical connector and disconnect by depressing the locking tab and pulling connector apart. Secure wiring away from work area to prevent damage during flex pipe removal. Note: verify whether this specific vehicle has an oxygen sensor in this location before proceeding.
2
Remove upstream flange connection
Locate the flange connection at the forward end of the flex pipe (typically connecting to catalytic converter outlet or intermediate pipe). Remove the flange bolts (verify quantity and bolt-head size against the actual hardware; typically 2 or 3 bolts). Note the condition of the flange gasket and discard if replacing. If bolts are seized, apply additional penetrating oil and use a 6-point socket to minimize rounding. As a last resort, cut bolt heads with a cutoff tool.
Torque spec
Flange Bolts45 Nm (33 lb-ft)
3
Remove downstream flange connection
Locate the flange connection at the rear end of the flex pipe (typically connecting to main exhaust pipe section). Remove the flange bolts (verify quantity and bolt-head size against the actual hardware; typically 2 or 3 bolts). Support the downstream exhaust section to prevent it from dropping and stressing exhaust hangers. Retain hardware if reusable, otherwise replace with new fasteners.
Torque spec
Flange Bolts45 Nm (33 lb-ft)
4
Release exhaust hangers
Identify the exhaust hanger(s) supporting the flex pipe section or adjacent exhaust components. Using an exhaust hanger removal tool or pry bar, carefully work the rubber isolator off the hanger bracket. The Viper exhaust typically has 1-2 hangers in this section. Inspect isolators for cracking or deterioration and replace if necessary.
5
Remove flex pipe assembly
With both flanges disconnected and hangers released, carefully maneuver the flex pipe assembly out from under the vehicle. The Viper's side-exit exhaust configuration may require angling the pipe to clear frame rails and body components. Note the orientation and routing of the flex pipe for proper installation of the replacement.
6
Clean flange surfaces and inspect components
Using a wire brush, thoroughly clean both upstream and downstream flange mating surfaces to remove old gasket material, carbon deposits, and corrosion. Inspect flange faces for warping, cracks, or damage that could cause exhaust leaks. Check exhaust hangers and brackets for damage or excessive wear. Verify that the replacement flex pipe matches the original in all dimensions and flange configuration.
7
Install new flex pipe assembly
Position the new flex pipe assembly under the vehicle, routing it in the same orientation as the original. Ensure the flex section is oriented to allow for proper engine movement (flex bellows should not be pre-compressed or extended). Align the pipe with upstream and downstream flange connections but do not fully tighten fasteners yet.
8
Install new flange gaskets and connect upstream flange
Place a new flange gasket at the upstream connection (forward end of flex pipe). Align the flex pipe flange with the mating flange and insert both flange bolts. Thread bolts by hand to ensure proper engagement. Once both bolts are started, tighten in a cross-pattern to the manufacturer-specified torque for this application (verify in service documentation) using a torque wrench.
Torque spec
Flange Bolts45 Nm (33 lb-ft)
9
Connect downstream flange
Place a new flange gasket at the downstream connection (rear end of flex pipe). Align the flex pipe flange with the mating flange on the main exhaust section and insert both flange bolts. Thread bolts by hand to ensure proper engagement. Once both bolts are started, tighten in a cross-pattern to the manufacturer-specified torque for this application (verify in service documentation) using a torque wrench.
Torque spec
Flange Bolts45 Nm (33 lb-ft)
10
Attach exhaust hangers
Position the exhaust system so that hanger isolators align with their respective hanger brackets. Using an exhaust hanger tool or pry bar, work each rubber isolator onto its bracket. Ensure the exhaust system hangs level and is not under stress or binding. The flex pipe should have slight slack to allow for movement.
11
Reconnect oxygen sensor wiring
Route the oxygen sensor wiring harness back to its connector location, ensuring it is not in contact with hot exhaust components or moving parts. Connect the oxygen sensor electrical connector by aligning and pressing together until the locking tab clicks into place. Verify the connection is secure.
12
Final inspection and clearance check
Visually inspect all flange connections, hangers, and hardware to ensure everything is properly secured. Check clearances between the exhaust system and surrounding components (frame rails, driveshaft, body panels, fuel lines) to ensure at least 1/2 inch clearance. Rock the exhaust system gently by hand to verify it moves freely on its hangers without binding or contact.

Reassembly

Lower vehicle from jack stands carefully, ensuring no tools or parts are left underneath
Remove wheel chocks

Verification

Start the engine and listen for exhaust leaks at both flange connections. A hissing or ticking sound indicates a leak that requires re-torquing or gasket replacement
With engine running, have an assistant apply throttle while you observe the flex pipe from underneath (engine cool, vehicle on level ground). The flex pipe should accommodate engine movement without stress on flanges or hangers
Check for any contact between exhaust components and body/chassis during engine movement
After a short test drive (5-10 minutes), re-inspect all flange bolts for tightness and check for any new exhaust leaks or rattles
Verify no exhaust smell in cabin during operation, which could indicate an upstream leak

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