Since the tuned pipe is one of the most important components of an engine, it is extremely important to use a tuned pipe set with each engine. We have designed 3 pipes sets which include the pipe, manifold and all the springs and gaskets. They are made to provide the maximum performance for your specific needs. Other pipes sets can be used, however only these pipes have been specifically designed with the WASP Rev engine and have been tuned to provide the highest performance available.