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Discussion Starter · #1 ·
having problems figuring out what exhaust to go with. need from engine back. 1991 f150 4wd 5.0 im in wisconsin and in the county i live in they dont test emmissions at all but im sure they will at some point and time. want to go with dual exhasut true but have the o2 sensor thing that i need to deal with. im going to start with shorty headers but what about y pipe and where will i place the o2 sensor and how to put that o2 sensor in
 
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