Exhaust System & Emission Control

Exhaust System/Emission Control

The exhaust system has been partially newly developed. The new 911 Turbo complies with all worldwide emission regulations with a standard exhaust system. The weight was reduced by using thin-wall technology for the muffler and ceramic main catalytic converters. It was therefore possible to reduce the overall weight of the exhaust system by approx. 8.8 lb/4 kg (16 %) compared with the 911 Turbo (996).







Ceramic Main Catalytic Converter

It was possible to further improve the emission values by the use of state-of-the-art catalytic converter technology with one 3-way ceramic main catalytic converter for each cylinder bank and by improved secondary air injection after cold starting (Europe: EU4; USA: LEV II).

Tailpipe Covers







The rear apron of the new 911 Turbo was completed redesigned. In addition to modified side outlet openings for the outgoing air of the charge air coolers, the new 911 Turbo is also equipped with integrated exhaust tailpipes. The tailpipes were relocated to a higher position compared with the 911 Turbo (996), and are integrated in the rear apron of the new 911 Turbo as a distinguishing feature and characteristic design element - analogous to the Carrera GT. In order to protect the rear apron against the high temperatures of the exhaust tailpipes, a shield made of high-temperature-resistant plastic capable of withstanding temperatures up to 536 °F (280 °C) is installed in the area surrounding the tailpipe.

Secondary Air Injection

The function of the secondary air injection system, with one secondary air valve per cylinder bank, each of which is pressure opened by a pump, is the same as in the current 997 vehicles. The secondary air valves with additional check valve were adopted from Cayenne Turbo.







The following switch-on conditions apply to activation of secondary air injection when the engine is started for the first time:
- Engine temperature (coolant): 14 °F (- 10 °C) to 108 °F (42 °C).
- Time: Max. 120 seconds after engine start
- Mass air flow as switch-off condition: Secondary air injection is switched off after a time delay as from a mass air flow of greater than 200 kg/h.