P0430 possibly caused by section of flex pipe ?

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A97obs

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Has anyone gotten some opinions on a nice exhaust rework Experience on the Tahoe suburbans?
I want to redo the muffler anyhow and if I need to buy a cat now and ad it back I may as well route things and change to a better sounding exhaust .
I was considering eliminating the crossover and do straight duals to the back with high flow cats off each bank and two Borlas and exit angle tips at each bumper corner ..

Or add a high flow cat keep the OEM down pipe design and swap to a single Borla and dump it Before the rear differential with a down pipe or exit out the side in front of rear tire.
Trucks lowered 4/6 and I don’t like the tail pipe so close to the diff and body

I need to change it up if I’m doing anything at this point .
 

A97obs

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Mystery solved by the looks - but for where the missing cat is. Stolen?
Who knows the cat may have been stolen
Years ago It came up from California a year ago from the seller I got it from it’s probably likely , I wouldn't have a clue. Im sure the theft rate there is always at peak season when it comes to chop shop crimes
 
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