Borla Performance Exhaust products are manufactured from T-304 Stainless Steel, are mandrel bent and have a ONE MILLION MILE Warranty. Borla's cat-back system for the 1998-02 F-Bodies (Z-28 Camaro / Trans Am) is a dual-purpose system that starts at the rear of the y-pipe with a 3" intermediate pipe and goes over the rear axle. From there the exhaust flows into a Y-pipe with dual 3" diameter exhaust tips and a high-flow muffler. Four interchangeable plates come with the system which allow you to adjust noise and performance levels. Using the solid plate diverts all of the exhaust through the muffler (quietest setting) The other plates have holes of various diameters, ranging from 2 1/2" down to 1 1/2". Refraining from using any plate at all results in a straight-through, free-flow exhaust which can easily be converted back to street-legal in a matter of seconds. All clamps and necessary hardware are included.