The Flowmaster® dBX® Cat-back exhaust system for these classic Miatas includes 2.25 in. mandrel-bent stainless steel tubing with a full length mid-pipe that follows the factory routing from the catalytic converter back to the muffler. The mid-pipe also includes an O2 senSingle Rear Exit fitting in the OEM position to ensure proper engine operation and emission compliance. The 304 stainless steel dBX Series muffler features Flowmaster Laminar Flow™ technology and connects to a single 2.25 in. tailpipe which sends exhaust through the cutout in the rear valence. This system is intended as a Spec Miata system, therefore no tip is included but one can be easily added. All necessary parts and hardware are included for a great fitting and simple installation. Like most dBX series systems, it will typically produces a moderate interior and exterior performance sound level and is covered by our Lifetime Limited Warranty.