Each PDR HX40 is custom made to PDR specifications, including modifications to the oiling of the turbo shaft. These modifications along with zero balancing have lead to a significant increase in reliability. The PDR HX40 comes with a 16cm exhaust housing. Our exhaust housing is specially modified for faster turbo spool up. Our proprietary modifications allow a 16cm housing to spool like a 14cm housing, while still maintaining the top end airflow of a 16cm housing.