Key Features: Mandrel bent Stainless Steel construction Virtually eliminates backpressure Lowers exhaust gas temps Dramatically improves flow Maximum Airflow Cut backpressure up to 94 percent Improve 0-60 mph acceleration times by 1/3 of a second (4.5 percent quicker) More than doubles flow 3 inch mandrel-bent cat-back 4.4 x 5.25 inch Cerakote Black Tip Single Exhaust, Side Exit US Patent #5,581,111 S1