engine conversion completed, 2006 mazda mx5 nc 2.0l motor, i built the custom Plenium myself out of 4mm aluminium and to ensure it still creates heeps of torque i put 80mm bellmouths inside the plenium at the end of the velocity stacks (tested and rated to 500-1000hp), i also made all the piping to the large front mount intercooler and the turbo manifold and 3 inch dump pipe, looks pretty tough