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Thanks for all of your inputs. I've booked in an appointment to replace the brand new Davico cat with the 20yr old factory cat next Monday. Also weld the cat end to the resonator connection to get rid of the current leaks which is very noisy. Hopefully this will resolve the power loss issue. Really looking forward to it. The car has no acceleration right now. Driving it a few more days is painful.
Finally fixed the power lost and noisy exhaust problem. The muffler shop helps to cut the factory 3rd cat and welds it back to my car. Quietness and normal power resumed....
Y to the 3rd cat The 3rd cat to resonators The end of the Davico Y pipe has reduced diameter for no reason
Great to hear that worked! Good information about the restriction inside the Davico Y pipe, I bet that was a large part of your power loss. Thanks for letting us know your conclusion.
If I were to do it again, I would just buy the 2pcs of those separated Y from Ebay and weld them to the factory cat instead of buying the entire Y costing more on parts and labor!
