Pypes Performance Exhaust's Mustang Crossovers are second to none! They all feature 2.5� Mandrel Bent, 409 Stainless Steel Pipe and fit in the Stock location. Flanges, Mounting Hardware, O2 Sensor Rings, Reinforcement Plates, Air Tubes and Ball Flare connections are all standard features (where applicable) on these exceptional Crossovers. Pypes Performance X-Pipe Kits for Short Tube Headers are a 3-piece modular assembly that makes installation much easier and also allows for lower cost shipping. Gain 8-12 HP and a Unique Sound!