BORLAÂ Cat-Backâ„¢ system 140238 is a 2.25" diameter full True Dual split side exit with single 4" round bright chrome on T-304 stainless steel tips on each tail pipe. A system with black chrome on T-304 stainless steel tips is also available. This system gives the Toyota a great look and a nice performance kick. It delivers that mellow Touring sound with no drone inside the vehicle. The muffler contains and internal H-Pipe for increased performance and improved sound. The full dual system even weighs less than the factory single system thanks to the lightweight T-304 stainless steel fabrication and not surprisingly out flows the stock exhaust. This BORLAÂ dual system even exhibits better fuel economy numbers which is nice for a big truck. BORLAÂ Cat-Backâ„¢ and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed to unleash hidden horsepower. Increased exhaust velocity adds power driving excitement fuel economy and the distinctive BORLAÂ Sound of Power respected by motoring enthusiasts everywhere. BORLAÂ the original pioneers of high quality T-304 austenitic stainless steel (superior to 409 or aluminized steel) free-flow exhaust utilizes patented award and race winning technology to deliver quality sound performance gains and enhanced fuel economy -- all with an easy bolt-on installation. Ultra-smooth mandrel bends ensure maximum flow & power and precision computer numerical control (CNC) manufacturing ensures an accurate fit. And backed by an unsurpassed written million-mile warranty. Oversize box shipping rates apply to this system.