Polyphonic Exhaust Systems by Borla. When you want the best performing, best sounding, and highest quality exhaust system, you want Borla. Borla straight-through, multi-core Polyphonic Exhaust Systems mufflers and mandrel-bent exhaust tubes are custom tuned to deliver the most horsepower possible, with the most aggressive sound of any Borla system. And the quality, aircraft-grade, austenitic stainless steel construction allows Borla to back every Cat-Back system with an unequaled million-mile warranty.

Features:

• Horsepower and Torque Increased by 7 – 10%
• Increased exhaust flow for better performance
• Better fuel economy at cruising speeds
• The most aggressive sound of any Borla system
• Custom designed for each application
• Patented straight-through, multi-core muffler design reduces backpressure while absorbing sound waves
• Mandrel-bent stainless steel tubes with diameters optimized for reduced restriction while maintaining exhaust gas speed
• Made from the finest austenitic stainless steel for long-lasting durability
• All welded construction
• Includes everything required for installation, including detailed instructions
• Backed by the exclusive Borla Million-Mile warranty
• Proudly made in the USA

Imagine many voices harmonizing together in a choir. When the right notes are sung together, an ethereal effect is created with dramatically more depth than a single voice. Pipe organs have done this for hundreds of years, using combinations of varying pipe diameters and lengths to form powerful chords. This technology caught the attention of our VP of Sales & Marketing David Borla, whose many years composing and performing in the music industry included a record contract with Sony. David worked with our R&D team to apply organ pipe mathematics to exhaust applications. The exciting result is the Borla Polyphonic Exhaust Harmonizer, which is now featured in select Borla exhaust systems.

These patent-pending units contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound to the Borla mufflers. The mufflers then enhance this sound to the character and volume appropriate for our Touring, S-Type and Polyphonic Exhaust Systems® systems.

The limitless combination of pipe diameters and lengths allows Borla to tune each application so that the best notes and harmonics of specific engines are highlighted.

Thanks to the straight-through design of the Harmonizers, Borla customers get the ultimate in tuned exhaust sound with zero loss in performance.

Finally, the best power and sound is meaningless if the exhaust system rots away in a few years. Each Borla exhaust is made using the finest materials and construction techniques to make sure this won't happen. They use austenitic stainless steel for their systems, which contains high levels of nickel and chromium, to resist corrosion. This material is harder than the lower grade stainless steel used by the OEM manufacturers, yet is very ductile. Nevertheless, the increased hardness requires special equipment to form and bend. The muffler contains stainless steel perforated tubes wrapped with several layers of stainless steel sound absorbing material and a layer of ceramic sound absorbing, high temperature material, all contained in a fully welded stainless steel shell.

The Borla Polyphonic Exhaust Systems Series Stainless Steel Cat-Back Exhaust System comes complete with everything required for installation, including detailed instructions. Borla is so confident in the quality of this system that it's guaranteed against defects in materials and workmanship for one million miles.