The PERRIN Overpipe is made from 2.5", 304 Stainless Steel and assembled with precision TIG welding. Unlike the factory 2.118" tubing with it's sharp, crimp type bends throughout, the PERRIN Overpipe is CNC mandrel bent for smooth air flow allowing for maximum horsepower.
PERRIN Flanges are CNC machined from 1/2" thick, 304 stainless steel and counterbored on the inside for a smooth transitions. When bolted to a PERRIN header or PERRIN Frontpipe you will see a perfect transition between the flanges ensuring no loss in air flow.
NOTE: In the state of California, performance high flow cats and test pipes are intended for off-road use only and are never to be operated on a public road or highway. Check your state and local law requirements and regulations.