This is a Thermal muffler and piping cat back, it's 3 inch diameter on the mufler. It's from a sedan for Honda Civic 92-95 that was turbo charged and i believe it fits on the integra sedan. This is perfect setup for turbo. It came out of a showcar that was parted out. Any questions let me know. $350.00 or better offer. I live in VA, pickup available.