Choose from up to four signature Borla Exhaust Series (depending on your vehicle):. Touring Series:The Touring series provides a deep, throaty sound that is slightly louder than stock at open throttle. Perfect for those who prefer a great sounding exhaust but also don. S-Type Series: Opening up your exhaust to make your engine more efficient and freeflowing; the S-Type Series boasts a quality of performance oriented sound. This system will allow your car to be more aggressive but still allow you to cope with your normal spirited day to day driving. ATAKSeries:When you love to go full throttle and hear that exhaust pour through the city, Borla. Multicore Series:Mellower than the S-Type, but boasting a distinct growl, the Multicore series optimizes the aggressive sound you love and provides you solid performance gains. Custom designed for your specific vehicle to generate maximum performance. Crafted entirely from aerospace-grade T-304 stainless steel for corrosion-resistance to ensure your exhaust won. Mandrel bent tubing eliminates kinks, blockages and excessive back-pressure to keep the pipes free-flowing. Bolster horsepower and torque in addition to improving fuel economy. Kits incorporate Borla's patented multi-core and straight-through muffler designs. Installs directly to your vehicle. Include the required clamps, connectors and hardware. Street legal in all 50 states. Your Borla Exhaust System is extensively tuned and tested and backed by a Million-Mile Warranty Click for sound clip (mp3). Bolt-in exhaust kit requires no cutting or welding. Main piping diameter: 2.75" into muffler. 2.25" out. 4" round. rolled edge. angle-cut. polished tips. No interior drone noise.-Borla Exhaust Systems