PORSCHE 997 Carrera S Cabrio 3.8i (355 Hp) '05 -> '08

Metallic catalytic converterS

The Supersprint Metallic catalytic converters have been developed and tested with the specific purpose of greatly decreasing the exhaust gas backpressure at all rpm, while at the same time guaranteeing an ideal reduction of the emissions. The Oversize inlet and outlet pipes are 63.5mm o.d. (stock is 55mm). The HJS cats are made in Germany by Emitec, the established world leader in performance and racing catalytic converter technology. While the stock cat system uses extremely restrictive, 400cpsi beds, the Supersprint system uses 100cpsi metal beds. Actually the stock exhaust uses 4 cats, 2 cats on each side of the exhaust system, while Supersprint only uses 2 cats, one on each side. The cups of the Supersprint cats are made specific for the 997, and their angle, volume and shape all work together in order to provide the best exhaust gas flow. On the new 997, just like on the previous 996, the space available for the exhaust system in the engine compartment is extremely small and cramped. This situation can easily cause the exhaust system's flow rate to be seriously compromised if the pipe layout and the components connecting tubes are not properly designed. In this critical area Supersprint has placed a great deal of attention. The reduction in exhaust gas backpressure provided by the Supersprint exhaust at peak rpm (6600) is an astounding -40%. At most points throughout the rpm range, the decrease in backpressure is even higher.

Engine rpm	Exhaust backpressure bar	Decrease in backpressure	Engine HP increase	Engine torque increase Nm	Difference %
2000	0.02	-50%	+12.4	+43.5	+14.5%
3000	0.01	-70%	+1.1	+2.5	+0.5%
4000	0.05	-60%	+27.7	+48.5	+14.0%
5000	0.11	-45%	+21.5	+30.2	+8.0%
6000	0.15	-50%	+17.9	+21.0	+5.5%
6700	0.21	-40%	+23.4	+24.6	+7.0%
7000	0.22	-37%	+23.1	+23.1	+7.0%

As displayed in the above chart, the increase in Hp and torque is equally astounding. The high exhaust flow-rate also provides for lower operating temperatures of the engine when under a load for extended periods of time. This makes the performance output less susceptible to the "heat soak". The Supersprint cats, thanks to their premium coating process and perfect blend of the Platinum, Palladium and Rhodium metals, are entirely compatible with the stock, OBD II emission management system. The Oxygen sensors must be simply plugged into the ports of the Supersprint cats. Due to this, the CEL (Check Engine Light) will not appear on the dashboard, because the full Supersprint exhaust is in use.