This is the Ultimate Racing EFRA 2141 Super Strong One-Piece Off-Road exhaust system. The pipe has been welded to the manifold to improve performance. This EFRA 2141 hi-quality aluminum exhaust has been designed to improve the overall performance of your engine. It produces a precise and linear throttle response in the low to mid RPM range with a great top end speed. This pipe set will provide great power to your engine up to the high RPM range to produce a great and easy to drive power curve. All these characteristics will provide great torque for those very demanding tracks with sharp corners and hard to clear jumps.