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1991 Jeep Wrangler
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Product Details

flowmaster exhaust system

Jeep Wrangler 4.0L 1991, Scavenger Series Stainless Steel Silver Ceramic Coated 6-2-1 Style Unequal Length Elite Exhaust Headers by Flowmaster®. Primary Tubing Diameter: 1.5". Collector Outlet Diameter: 2.25". Emissions: CARB compliant. Finish: Silver Ceramic Coated. Color: Silver. Header Coating: Ceramic Coating. Header Style: Short Tube. Without Reducers. Replace your restrictive factory exhaust manifolds with these stainless steel headers and let your engine breath! These headers are easy to install because they're designed to directly replace the manifolds and connect to the factory exhaust. They're ceramic coated for a long lasting premium appearance and come with everything required for installation.

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Series: Scavenger Series
Header Style: Short Tube
Primary Diameter: 1.5"
Collector Diameter: 2.25"
Emissions: CARB compliant
Sema Emissions Code: 1
Header Material: Stainless Steel
Inlet Port Shape: Round
Finish: Silver Ceramic Coated
Attachment Method: Stock Flange
Laser Cut Flanges Thickness: 0.375"


  • Increases horsepower and torque
  • Improves engine efficiency and throttle response
  • Dyno tuned for maximum performance
  • Improves exhaust flow
  • Durable stainless steel construction
  • High temperature ceramic coated
  • Uses factory exhaust connection
  • Comes complete with everything required for easy installation
  • 50 state legal
  • Backed by a 1-year limited warranty
  • Proudly made in the USA

NOTE: This product is legal only for off highway use (except in California or states that have adopted California emissions standards), racing use or for use on pre-emission controlled motor vehicles/motor vehicle engines (pre-1966 domestic vehicles certified to California standards, pre-1968 domestic vehicles certified to federal standards and all pre-1968 foreign vehicles), according to application.

Unfortunately, when most factory exhaust manifolds are designed, more attention is paid to how easily they fit in the engine compartment instead of how they affect performance. Most manifolds are inefficient because more than one cylinder dumps exhaust into the same small space. Their restrictive shape chokes your engine, bottling up hidden ponies that are just waiting to be released.

These long tube headers enable your engine to develop its potential in two ways. First, the large diameter individual tubes allow the exhaust to flow unobstructed from the cylinder head, and second, the length and diameter of the tubes are optimally designed for the engine's exhaust pulses. As the exhaust pulse travels down the header tube, its momentum creates a vacuum behind the pulse as the exhaust valve closes. This helps "scavenge" the remaining exhaust from the combustion chamber as well as help draw the intake charge in. The increased flow and scavenging results in gains in horsepower and torque, and performance improvements you can feel.

But all these performance improvements mean nothing if the headers rust out in a few years. Flowmaster ensures that this won't happen with Scavenger Series Elite headers by constructing them with durable 409 series stainless steel and then coating them with a high temperature resistant ceramic coating. 409 stainless steel is particularly suited to exhaust systems because it resists both atmospheric and exhaust gas corrosion, and the ceramic coating will ensure your headers remain an attractive part of your engine bay.

Scavenger Series Elite headers are manufactured with rigid 3/8" thick flanges to ensure perfect sealing at the heads, and they feature Flowmaster's leak-free ball and socket flange to connect with your exhaust system. There's no need to mess with leaky 3-bolt collector flanges and gaskets. Your headers come with gaskets, hardware and everything necessary for easy installation, including detailed instructions. They're backed by a 1-year limited warranty against defects in materials and workmanship, and they're proudly manufactured in the USA.

Flowmaster® has its roots in solving the engine noise problems encountered by California racers in the 1980s. In 1983 Flowmaster's founder, Ray Flugger, created his first patented design of racing silencers, which dampened noise with minimal loss of power. Ray attached handles to ease carrying the square shaped race mufflers through the race pits, and the mufflers became known as the "suitcase mufflers." Today, the innovative Flowmaster mufflers are the result of years of development with top race engine builders, thousands of hours of dyno research and "real-world" on-track testing.

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Warranty Information

Lifetime Limited Warranty applies to Flowmaster stainless steel mufflers, stainless steel exhaust systems, stainless steel pipes and other stainless steel exhaust accessories (except exhaust tips).

Three (3) Year Limited Warranty applies to Flowmaster aluminized steel mufflers, aluminized steel exhaust systems, aluminized steel pipes, exhaust tips and other non-race exhaust accessories.

One (1) Year Limited Warranty applies to Elite Series exhaust headers. Flowmaster, Inc. (“Flowmaster”) extends the following limited warranty to the original purchaser of its mufflers, exhaust systems, pipes, exhaust tips, headers and other non-race accessories (hereafter “products”), excluding catalytic converters sold under the Flowmaster® brand.

Flowmaster warrants the products mentioned above against defects in materials and workmanship for the period set forth below, when they are owned by the original purchaser and remain installed on the vehicle on which they were originally installed. This warranty is void if the product was not installed properly on the vehicle, was installed on a vehicle for which it was not designed, or was removed from the vehicle on which it was originally installed and reinstalled on another vehicle. This warranty shall not apply to normal wear, cosmetic issues such as coatings and material discoloration, any product that was installed on a racing vehicle, installed improperly or contrary to Flowmaster instructions, altered, misused, repaired, damaged from an accident, collision, undercarriage road impact or debris, or willful or negligent act.

The warranty set forth herein for Flowmaster® stainless steel mufflers, stainless steel exhaust systems, stainless steel pipes and other stainless steel exhaust accessories (except exhaust tips) extends for a period of the life of the original vehicle the product was installed on. The warranty set forth herein for Flowmaster aluminized steel mufflers, aluminized steel exhaust systems, aluminized steel pipes, all exhaust tips and non-race exhaust accessories and commercial applications of aluminized steel products or stainless steel products extends for a period of three (3) years from the date of original purchase and the original vehicle it was installed on. The warranty set forth herein for Flowmaster exhaust headers extends for a period of one (1) year from the date of original purchase and the original vehicle it was installed on. Header warranty does not cover damages caused by exhaust insulating wrap, and is void if the product was installed on a new or rebuilt engine during the initial break-in period.

This warranty is not contingent upon the purchaser’s completion of the Warranty Registration Form found on the Flowmaster® website. If however the purchaser completes and submits that form at the time of purchase, Flowmaster will keep that form on file which may serve as an aid in determining warranty coverage in the event of the loss of the original purchase receipt.

Flowmaster’s liability is expressly limited to the replacement of the product or refund of the purchase price as described herein. Flowmaster® shall have no liability for the cost of installation or removal of the defective product, the cost of labor or any additional parts required to complete the installation of the replacement product, towing or transportation costs, or return shipping costs. In no event shall Flowmaster be liable for any direct, indirect, special, incidental or consequential losses and/or damages, including but not limited to interruption of business or loss of business or loss of profit or damage to related components resulting from the use of or inability to use the product, or any breach of warranty or any defect in the product, even if Flowmaster shall have been advised of the possibility of such potential losses or damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights. You may also have other rights which may vary from state to state.

The warranties set forth herein are exclusive and unless otherwise required by applicable law no other warranties are made by Flowmaster® or are authorized to be made with respect to the product.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

1999 Jeep Wrangler
  • 4.0L
  • This part is CARB compliant.
1998 Jeep Wrangler
  • 4.0L
  • This part is CARB compliant.
1997 Jeep Wrangler
  • 4.0L
  • This part is CARB compliant.
1995 Jeep Wrangler
  • Sahara / SE 4.0L
  • This part is CARB compliant.
1994 Jeep Wrangler
  • 4.0L
  • This part is CARB compliant.
1993 Jeep Wrangler
  • Base / Renegade / Sahara 4.0L
  • This part is CARB compliant.
1992 Jeep Wrangler
  • 4.0L
  • This part is CARB compliant.
1991 Jeep Wrangler
  • 4.0L
  • This part is CARB compliant.

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