2005 Mercury Sable / Ford Taurus catalytic converter Y-pipe

3.0L OHV engine replacing Y-pipe with the two cats connected directly to the exhaust manifolds

[@TeamWagy]

Did the vehicle have little power when driving? I have a 2005 Taurus with this engine and have cat codes for the rear bank but the car has no power on any type of incline.

[@GibsonGarage]

there was no apparent loss of power. You might try a full tune up and O2 sensors first