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#2: 07-17-2012, 09:00 AM
PeterJMC's Avatar
Title: Lvl 63 Night Elf Dwarf Paladin
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Location: Petey Petes Crazy Garage, MD
Car: '13 Toyota Prius Five
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You are correct, the stock downpipe (DP) has two catalytic converters. There is a third catalytic converter in the uppipe.

You may or may not throw a Check Engine Light (CEL) if you go from the stock setup to the Invidia or any other similar pipe. When I installed my Cobb DP w/high flow cat, I didn't throw a CEL.
'13 Prius Five