Monster Exhaust System for 2004-2006 Jeep Wrangler TJ and LJ Unlimited 4.0L Huge 2.5-inch stainless mandrel-bent tailpipe. Flows up to 140 Percent better than stock. Chrome tip with Straight-thru Monster muffler. For maximum results, combine with Banks Torque Tube system. Huge 2.5 inch stainless mandrel-bent tailpipe with a polished or Black tip. Straight-thru Monster muffler flows up to 140 percent better than stock. Slashes backpressure; throaty sound. Constructed 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.
2004 LJ - noticeable increase in low and mid range torque and better throttle response. Had the same system on my prior 2001 TJ I installed 8 years ago and because I was satisfied I purchased and installed on my newer LJ.