Dynatech Split-Flow Race Mufflers - The Split-Flow Racing Muffler is the ''hot topic'' among racers, and for good reason. The straight-thru design can handle big power. The exclusive dual pattern core and stainless steel sound-absorbing material that will not burnout, reduces dB levels while maintaining a powerful sound. The all aluminized and fully welded muffler construction makes it a top choice for racing and high performance applications.