Banks Power 51327 Revolver Header for 91-99 Jeep Wrangler YJ, TJ, Cherokee XJ & Comanche MJ with 4.0L
Performance Exhaust Header Upgrade: Replaces the restrictive factory exhaust manifold with a high-flow tubular header designed to improve engine breathing and exhaust efficiency.
Legendary 4.0L Jeep Fitment: Engineered for 1991–1999 Jeep Wrangler YJ, Wrangler TJ, Cherokee XJ, and Comanche MJ models equipped with the 4.0L inline-six engine.
Revolver Header Performance Design: Tuned primary tubes help improve exhaust scavenging for increased horsepower, torque, and throttle response.
Heavy-Duty Construction: Built from premium materials to withstand extreme exhaust temperatures and resist cracking under demanding conditions.
Direct-Fit Installation: Designed to mount in place of the factory manifold using existing exhaust and cylinder head mounting locations.
CARB Notice
- 50 State Legal - CARB E.O. Number D-161-105
Unlock the performance potential of Jeep's legendary inline-six engine with the Banks Power Revolver Header. Designed specifically for 1991–1999 Jeep Wrangler YJ, Wrangler TJ, Cherokee XJ, and Comanche MJ models equipped with the 4.0L engine, this performance header replaces the restrictive factory exhaust manifold with a carefully engineered tubular design that improves exhaust flow and overall engine efficiency.
Banks developed the Revolver Header to maximize exhaust scavenging and reduce backpressure, helping the 4.0L engine breathe more efficiently throughout the RPM range. The tuned tube design supports increased horsepower, torque, and throttle response while maintaining everyday drivability. Constructed from heavy-duty materials and engineered to withstand years of exposure to extreme exhaust temperatures and harsh operating conditions, the Revolver Header also addresses common durability concerns associated with aging factory manifolds. Whether you're restoring lost performance or upgrading your Jeep for improved power and responsiveness, the Banks Power Revolver Header delivers the quality, engineering, and reliability that have made Banks a leader in performance exhaust technology.
Non-deforming manifold outlet seal
Self-aligning exhaust seal will never compress or blow out - Bolts easily to stock exhaust
"Revolver" Collector
Banks' patented collector design with extended center tube is designed to pull the exhaust pulses from the engine for crisp throttle response on the draw
Manifold tubes fully welded
Each tube is welded to the flange twice, inside and out
Super-duty manifold flanges
1/2"-thick flanges never warp or crack - Computer-controlled machining - Precision port-match to cylinder head
Unrestricted Exhaust Ports
Tubes sized and shaped to match cylinder-head exhaust port
Precision-milled manifold flange
Milled dead-flat after welding, for durability and a perfect seal every time
Stainless Steel
Sustains exposure to ultra-high temps for superior durability - Mandrel-bent tubing for better airflow
Level 3AdvancedTools Required:
¼" and 3⁄8" drive ratchets, extension w/ in. & mm sockets
in. & mm combination wrenches
Flat & Phillips head screwdrivers
Standard & needle-nose pliers
X-Acto knife
Shop towels
in-lb & ft-lb torque wrenches
- Color: Silver
- Motor: 6cyl 4.0L
- Material: 409 Stainless Steel
- Shipping Weight: 18lb
- Shipping Dimensions: 31in x 20in x 8in (L x W x H)
Jeep Cherokee (XJ)
- 1999 Jeep Cherokee (XJ)
- 1998 Jeep Cherokee (XJ)
- 1997 Jeep Cherokee (XJ)
- 1996 Jeep Cherokee (XJ)
- 1995 Jeep Cherokee (XJ)
- 1994 Jeep Cherokee (XJ)
- 1993 Jeep Cherokee (XJ)
- 1992 Jeep Cherokee (XJ)
- 1991 Jeep Cherokee (XJ)
Jeep Comanche (MJ)
- 1992 Jeep Comanche (MJ)
- 1991 Jeep Comanche (MJ)
Jeep Grand Cherokee (ZJ)
- 1998 Jeep Grand Cherokee (ZJ)
- 1997 Jeep Grand Cherokee (ZJ)
- 1996 Jeep Grand Cherokee (ZJ)
- 1995 Jeep Grand Cherokee (ZJ)
- 1994 Jeep Grand Cherokee (ZJ)
- 1993 Jeep Grand Cherokee (ZJ)
Jeep Wrangler (TJ)
- 1999 Jeep Wrangler (TJ)
- 1998 Jeep Wrangler (TJ)
- 1997 Jeep Wrangler (TJ)
Jeep Wrangler (YJ)
- 1995 Jeep Wrangler (YJ)
- 1994 Jeep Wrangler (YJ)
- 1993 Jeep Wrangler (YJ)
- 1992 Jeep Wrangler (YJ)
- 1991 Jeep Wrangler (YJ)
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Banks Power Revolver Header Reviews
I've used this header on a few Jeeps and it's awesome. Replaces stock manifold without any modification. Don't waste time and money with cheap replacement manifolds that don't last or fit.
Good price, 409 stainless steel and good ratings
Got this to go along with 2” walker down pipe, Flowmaster super 10 and Magna flow high flow cat and it sounds great.
Questions
The primary issue is the change in cylinder head design that occurred in 1991. Here is the breakdown of why this fitment is tricky and what your options are:
Compatibility Challenges
Port Matching: Your '89 XJ uses the "Renix" era 4.0L engine with high-port intake and exhaust. The 1991+ models (covered by the Banks 51327) use the "High Output" (HO) head. The exhaust ports on the Banks header are shaped and positioned for the HO head; if bolted to a Renix head, you may experience significant exhaust leaks because the header flange may not fully cover the head ports.
EGR System: Your 1989 XJ originally came equipped with an EGR (Exhaust Gas Recirculation) system. The Banks 51327 header does not have a provision (bung) for the EGR tube. If you are required to maintain emissions compliance, this header will not work without custom fabrication.
O2 Sensor Placement: While the Pacesetter you are currently running likely has a specific location for the O2 sensor, the Banks unit is designed for the 91-99 downpipe configuration.
Comparison to your Pacesetter 72C1190
The Pacesetter 72C1190 was designed specifically for the 1987-1990 Renix 4.0L. Since you are already running an aftermarket header:
Condition of the Pacesetter: If your current header is cracked (a common 4.0L issue), moving to a high-quality stainless steel header like the Banks is a massive upgrade in durability, but it requires the right fitment.
The "Back to Stock" Question: You do not have to go back to a stock cast-iron manifold. However, if you want a "good replacement," you should look for a header specifically cataloged for the 1987-1990 model years to ensure the EGR and port alignment match your Renix engine.
Recommendation
If you truly want to run the Banks Revolver, you would likely need to:
Swap to a 1991+ Cylinder Head (0630 or 7120 casting).
Modify your exhaust to eliminate or bypass the EGR (depending on local laws).
Otherwise, I recommend searching specifically for 1987-1990 Jeep XJ 4.0L headers to ensure a seamless swap without the need for welding or port-matching issues.
