Brand new in original box. Comes with 1 set of 4" racing spiral flow exhaust muffler with silencer. Made of high quality T-304 stainless steel ( light weight design ). Slant titanium tip diameter : 4", inlet tip diameter : 2.5". Significantly reduce noise levels w/ minimal back pressure. Professional installation is highly recommended. Vehicle Fitment: Fits for most vehicles with 2.5" diameter inlet size (Fits piping diameter between 2.25" to 2.75")