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Originally Posted by adley
I think modding a hybrid's intake and exhaust (past the cadylidics) is a good idea because hybrids usually run pretty rich to cut down on monoxide pollutions. but if you change the headers and downpipe then you usually lose the cadylidics witch can make your car run bad because of all the o2 sensor (3)
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They run rich? You wanna look into that statement??? Part of the AT-PZEV rating is the Advanced Lean-burn technology. The only thing that running rich would do is foul up your cats or release unburned hydrocarbons and waste gas. Total opposite.
I/H/E could interfere with the lean-burn unless the sensors and ECU can compensate for it, but more airflow while maintaining a steady A/F ratio would mean more gas... The trade-off that you're benefiting from would be that you might get a little more torque down low, which the CVT is not hesitant to shift you into when cruising.