This is the REDS Engines 3.5cc X-Short Off-Road Manifold. This manifold is ideal for the R Series REDS Engines 3.5cc .21 nitro engines. Package includes one gasket, one long spring and two short springs. This manifold will help provide a smoother torque delivery but with increased top speed.
Models available: M (Medium) is recommended for short tracks where more bottom torque is required, top speed will be lower. S (Short) is recommended for medium or standard tracks; it is a good compromise between torque and top speed. XS (Extra Short) is recommended for tracks with long main straights and to achieve the highest top speed but lower bottom torque.