DOING SOME MODIFIECATION ON MY 250 HPDI, LIKE SHAVING THE HEADS ,INSTALLING CARBON REEDS AND THINK OF MODIFIEDING THE STOCK EXHAUST TURNER. I SEE FROM THE STOCK AND HYDRO TEC THE PORT AND STARBORD EXHAUST ARE DRIFFENT LENGHTS. IT SEEMS LIKE THE LENGHTS WOULD BE THE SAME. CAN SOME ONE TELL WHY?