True dual to Y-pipe?

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Currently i have the stock dual inlet/single outlet exhaust on my ECSB (5.7 vortec)
A friend of mine is selling a custom exhaust from his RCSB...
His exhaust is a Y-pipe with cat,muffler and side exit..

can i swap the dual for the y-pipe without any issues?

UPDATE: the exhaust i am looking at is from a 305 TBI motor and i am not sure if it will work on my 350 SFI Vortec
I am not too great when it comes to the mechanical stuff...any info that you guys can offer is greatly appreciated
 
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No...i have 2 cats and 4 o2 sensors...the new one has 1 cat and 2 o2 sensors..
I was just curious if there was a way to remove my exhaust and add the new one without changing the ECU..but i guess i would have to if i am removing 2 o2 sensors
 
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its showing a code now because of the exhaust..which is why i am trying to replace it...i did find a brand new catalytic converter set-up for $250..which is almost unheard of at that price....but if i cant get this entire exhaust system (minus the manifolds) for $200 ,id rather go with that

as for making the 4 sensors into 2...thats basically why i posted this thread..to find out if its possible lol
 
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first picture is the setup that i have...second picture is the exhaust id like to put on my truck
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dcZ71

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tbi's dont have post cat o2's right?
 
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dcZ71

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so you would have to weld in bungs for the rear o2's and wire them up, sounds like a pita
 
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