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Discussion Starter #1
So my stock y7 manifold has 2 sensors one on top of manifold and a lower one by the cat. Do i need to hook both of those sensors back up after car gets tuned on crome im having more welding done on downpipe so do i need 2 ports ?
 

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Discussion Starter #2
Current downpipe only has one spot on it for an 02 sensor right after the five bolt flange to the turbo . So since im getting welding done now is the time to add a second spot for 02 sensor if i need it ...?
 
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