helo friends , here i do some modification on cultus exhaust manifold on the suggestion of Mr Zulfiqar ,,,,,,,,,,,,,the point is that the linear thermal expansion of alminum and cast iron is different , melting point of alminum is lower than that of cast iron hence it expands on a greater rate irrespective of that of cast iron , by making these cuts we allow the alminum to expand and contracts while at the same time there will less stress of exhaust manifold on it , ,,,,,,,,manifold wont put much stress while the alminum expands or contracts...............you may have noticed that many times headgaskit fails , i guess it more because of the expansion of alminum , and you may need to re surface your car's cylinder head , may be this mod can prevent such problems in futhure,,,,,
thats why my mind says ,,,,,,,,,,,,further more Mr Zulfiqar can explan batter ,













