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As long as it's for your motor and is the same size pipe as the rest of the exhaust it should be fine. Just make sure the mounts on the y pipe and headers are the same.
JBA Headers Y-Pipes 2945SY this is the part it says it fits a 96 318 dakota 4x4 but auto only as far as i know the y pipes auto or standerd are the same
Now I could be wrong but looking at the y pipes. It seems the y pipe for an auto trans is shorter, A manual trans y pipe has more of a curve to get under the trans and connect to the passanger side pipe. it may fit and bolt right up but I'm betting it will rub and squeak on the bottom of your manual trans if it reaches around the trans.
well i got my hands on a 92 factory y pipe from a 318 auto if it fits right will that prove it will fit or would i have to get one off a 96 and try it.