These direct-flow marine replacement exhaust systems are manufactured using the very latest lost foam technology.  This process produces the tightest aluminum casting structure while reducing porosity which is where the base of all corrosion starts.  Each manifold uses a separate runner design to direct exhaust gases directly to the exhaust riser without turbulence or power robbing back pressure enhancing exhaust flow over traditional cast iron systems.  Dramatic weight savings is achieved while increased water cooling area helps to prolong gasket life.  These systems are the perfect choice whether replacing or just mildly upgrading your system.

These manifolds have individual primaries for more torque and horsepower over your stock center rise or log style exhaust manifolds.  This is a great choice as an upgrade from log style manifolds. These manifolds have a steep down slope originally designed for jet boat applications. They are also available with a stainless steel riser.