Banks Revolver Exhaust Manifold for Jeep Wrangler 4.0L (1991-1999)
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Warranty Information
Vendor warranty summary
Banks Power Warranty
At a glance: Lifetime on Monster-Ram intakes and Ram-Air diff covers, five years on Ram-Air intakes and stainless exhaust, two on intercoolers and boost tubes, one on electronics.
This is Banks Power's warranty, not an NVMOS policy. We've summarized it in plain English to save you a search. The manufacturer's official terms always govern and can change without notice. Last reviewed on nvmos.com: November 4, 2026.
Coverage by product line
| Banks Power product | Coverage |
|---|---|
| Monster-Ram intake systems | Lifetime limited |
| Ram-Air differential covers, Ram-Air transmission pans, CoolRunner oil pans | Lifetime limited |
| Ram-Air and Twin-Ram intake systems and Banks air filters (oiled or dry) | 5-year limited (Twin-Ram rubber components 2 years) |
| TorqueTube exhaust manifolds and Revolver headers | 5-year limited |
| Monster exhaust and Dynaflow mufflers, stainless steel | 5-year limited |
| Monster exhaust and Dynaflow mufflers, aluminized steel | 3-year limited |
| Techni-Cooler intercoolers, boost tubes, Sidewinder turbocharger assemblies, StealthPod gauge pods | 2-year limited |
| Tuners (Derringer, Six-Gun, Economind, AutoMind 2), iDash gauges, PedalMonster, electrical and pneumatic components | 1-year limited |
| Remanufactured electronic products | 30-day limited |
What's covered
- Defects that render the product inoperable, regardless of mileage
- The original purchaser who bought from an authorized dealer and lives in the continental U.S. or Canada
- The product while it stays installed on the original vehicle
- Repair or replacement at Banks' option, or a similar product or pro-rated refund if a replacement is not reasonably available
What's not covered
- Race applications and off-road use
- Improper storage, installation or maintenance, misapplication and improper operating conditions
- Accidents, neglect, mistreatment, improper repair or alteration
- Products bought through auction websites
- Service conditions such as soot buildup from an out-of-tune engine or heat damage from overly rich fueling
- Deterioration of plating, paint or other coatings
- Sound
- Labor to remove and replace the product, towing, rental vehicles, hotel costs and other incidental or consequential damages
- Any amount above the original purchase price, and transfer to a second owner
How to make a Banks Power warranty claim
- Call Banks at (800) 601-8072 for a Return Material Authorization (RMA) number before sending anything; returns without one are refused.
- Have a complete service history and proof of purchase ready: a legible, dated bill of sale from an authorized dealer.
- Write the RMA number in large letters on the outside of the box and include a copy of the original invoice.
- Pack the part with enough padding and ship it freight prepaid to Gale Banks Engineering, Return Dept., 546 S. Duggan Ave., Azusa, CA 91702-5136.
- Banks decides the claim and returns repaired or replacement parts freight collect.
Banks Power contact: Banks technical and warranty support: (800) 601-8072 (call or text), 8:00am-5:00pm PT, Monday-Friday. Customer service: 888-839-5600. Gale Banks Engineering, 546 S. Duggan Ave., Azusa, CA 91702 · Warranty page
Bought it from NVMOS? Start with us.
Banks asks for a dated bill of sale from an authorized dealer, a service history and an RMA before it will look at a part, and it ships repaired parts back freight collect. Contact NVMOS first: we have your order record, can help confirm whether the problem is the part or the setup, and will help you get the RMA and paperwork together. Have your order number and a few photos of the issue ready, then call or text us at (920) 249-7744 or send us a message.
Shop Banks Power at NVMOS
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Banks Monster-Ram Intake Elbow & Grid Heater Upgrade for Ram 3500 Chassis Cab 6.7L Cummins (2013-2018), Red
Banks Derringer Gen 2 Tuner w/ iDash DataMonster for Chevy/GMC 2500/3500 HD 6.6L Duramax L5P (2017-2019)
See all Banks Power products, lead times and FAQs →
Disclaimer: The information on this page describes Banks Power's own warranty policy. It is not a warranty offered by NVMOS (No Visible Means of Support LLC). Manufacturers update their terms at any time; we review these pages periodically, but the manufacturer's current official policy is the one that applies to your claim. Sources: Banks Product Limited Warranties (official) and Banks Technical and Warranty Support (official) and Banks FAQ (official) and About Banks Power: company history (official). Last updated on nvmos.com: November 4, 2026. See our return policy for NVMOS's own terms.
About the brand
Banks Power is the performance parts line of Gale Banks Engineering, which has been building gas and diesel power since 1958 and runs a 12-acre engineering and manufacturing complex in Azusa, California. At NVMOS we carry Banks intakes, Monster exhaust, intercoolers and boost tubes, Derringer tuners, PedalMonster throttle controllers, iDash gauges and differential covers for the Ram, Ford, Chevy, GMC and Jeep trucks we support.
Based in: Azusa, California · Lead time: In-stock parts ship in 1-3 business days; parts stocked at the manufacturer take about 1-2 weeks.
Shop all 203 Banks PowerWarrantyAll brands
Warranty terms are set by Banks Power, not NVMOS, and can change. Bought from us? Call (920) 249-7744 and we'll handle the claim with the brand.
Banks Revolver Exhaust Manifold for Jeep Wrangler 4.0L (1991-1999)
The Banks Revolver is a replacement exhaust manifold for the Jeep Wrangler 4.0L (1991-1995, 1997-1999), built from mandrel-bent 409 stainless tubing with a 1/2 in. thick ported and machined flange. Its Revolver collector uses a longer center tube to turn exhaust pulses into torque across the rev range. It suits 4.0L owners who want more torque and a tougher manifold.
| Spec | Detail |
|---|---|
| Fitment | Jeep Wrangler 4.0L (1991-1995, 1997-1999) |
| Engine | 4.0L inline-six |
| Material | 409 stainless steel, mandrel bent |
| Flange | 1/2 in. thick, ported and machined |
| Part number | 51327 |
| Weight | 17.4 lb |
Confirm your Wrangler has the 4.0L engine and check the model year before ordering. Not sure it fits your build? Call or text us at (920) 249-7744 with your year, trim and setup and we will confirm it.
Will it fit my Jeep?
It fits the Jeep Wrangler 4.0L (1991-1995, 1997-1999).
What is it made of?
Mandrel-bent 409 stainless steel with a 1/2 in. thick flange.
Will the flange warp?
The 1/2 in. thick flange is built to resist warping and flexing.
What is the warranty?
See our Banks warranty page for the current terms.
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Specifications
Banks Revolver Exhaust Manifold for Jeep Wrangler 4.0L (1991-1999) FAQs
Will it fit my Jeep?
It fits the Jeep Wrangler 4.0L (1991-1995, 1997-1999).
What is it made of?
Mandrel-bent 409 stainless steel with a 1/2 in. thick flange.
Will the flange warp?
The 1/2 in. thick flange is built to resist warping and flexing.
What is the warranty?
See our Banks warranty page for the current terms.
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