Exclusive Patented Flow Director Design Channels Exhaust Flow. Eliminates Turbulence. Large Internal Flow Tubes Improve Exhaust Flow. Large Internal Flow Tubes Reduce Backpressure. Fiberglass Matting Tech To Absorb Unwanted Interior Resonance. Maintains A Mellow Performance Tone. Dyno Proven To Flow Up To 700 SCFM/Support Up To 636 HP. Proudly Manufactured In The USA.