Exhaust system to open air — everything from the header back. Header-back systems are generally produced as aftermarket performance systems for cars without turbochargers. The Turbo-back (or turbo back) is the part of the exhaust system from the outlet of a turbocharger to the final vent to open air. Turbo-back systems are generally produced as aftermarket performance systems for cars with turbochargers. Some turbo-back (and header-back) systems replace stock catalytic converters with others having less flow restriction. Some systems (including in former time all systems) (sometimes nowadays called catless or de-cat) eliminate the catalytic converter. It is illegal and is against Federal
Exhaust heat recovery system studies a Rankine system for long distance vehicles that could lead to 10% fuel savings. The goal is to produce enough energy to feed the components and electronic auxiliaries with electricity and reduce the fuel consumption by reducing the load on the alternator. Double Arrow Engineering's WildFire Heat Recovery System (WFHRS) is underdevelopment and utilizes wasted heat from both coolant and exhaust. This system mechanically adds power back to the drive-line, utilizing a Rankine engine as the energy conversion method. The WFHRS is designed for a verity of different applications, both fixed and variable RPM, aftermarket and OEM applications, but