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’91-08 Jeep 4.0L, 3.8L & 2.5L
Monster Flow, Performance, Sound & Looks
Huge 2.5" stainless mandrel-bent tailpipe with a polished tip. Straight-thru Monster muffler flows up to 140% better than stock. Slashes backpressure; throaty sound.
Monster® Exhaust, 4.0L & 2.5L
1991-05 4.0L and 2000-02 2.5L WRANGLER: Constructed entirely of heavy-gauge stainless steel, Banks Monster features a supersized, 2.5-inch tailpipe with a stainless tailpipe tip polished to a mirror finish. Banks Monster muffler, its straight-through performance muffler, is the industry's least restrictive. In comparison tests, Banks muffler flowed 501.2 cfm at 1 psi—a 140% improvement over the stock exhaust's 208.6 cfm, and about 44% better than the nearest competitor.
Monster virtually eliminates backpressure from the catalytic converter back, for more power and efficiency�and an authoritative, yet civil, exhaust note. For maximum results, combine with Banks TorqueTube® system.
Includes: Stainless Monster muffler; Stainless 2.5" tailpipe; Polished stainless tailpipe tip; Mounting hardware.
System Includes:
| Application | Year Range | Part # |
|---|---|---|
| Monster Exhaust 4.0L Wrangler |
1991-95 | 51311 |
| Monster Exhaust 2.5/4.0L Wrangler |
1997-99 | 51312 |
| Monster Exhaust 2.5/4.0L Wrangler |
2000-03 | 51313 |
| Monster Exhaust 4.0L Wrangler |
2004-05 | 51314 |
| Monster Exhaust 4.0L Unlimited |
2004-05 | 51315 |
Owners Manual(s)
| Monster exhaust ('91-05 Wrangler) (Part #96435) |  Download |
Accolades
“The company [Gale Banks Engineering] is renowned for its turbo designs, gas and diesel exhaust systems, exhaust braking systems, and the quality engineering that goes to each component.”
— 4 Wheel Drive & Sport Utility (Oct '03)