A cat-back exhaust increases performance by upgrading a stock exhaust with a large diameter and more efficient mid-pipe, muffler, and tailpipe.FLASHARKexhaust systems are made of SUS-304 Stainless Steel with a fully polished surface, CNC machined flanges and mandrel bends. It also serves to improve horsepower, torque, and overall performance with its straight-through design.