X-Change X-Pipes allow you to open and close your exhaust with the bolting or unbolting of dump plates. By exiting before the mufflers, you will make even more power! Because V8's fire unevenly, exhaust exits in pulses rather than a steady flow. While one pipe is filled with pressure the other pipe is relatively pressureless but the connecting of the two pipes in a siamese pattern allows pressure to be released to the other side. This action allows the exhaust to pass through the pipe quicker and increases horsepower. There's no skimping on materials here. All crossovers include dual stainless reinforcement plates at the welds where they are needed most. All pipes are are mandrel bent, to allow for the maximum flow of exhaust gasses, which boosts acceleration. Fabricated using the highest quality materials, smooth, seam-coated, mandrel-bent, stainless steel pipe resists corrosion and extends the life of your system.