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1. Is the OBD2 version a pain in the ass to do anything to, in particular turbo? it's seems that is usually the case.
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i don't see why obd2 would make turboing the car any harder.
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2. Also can I use a early harness/ecu from say a 91-94 OBD1 DE? will it swap over? are their any sensors that don't match up?
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the distributor harness plugs
coolant temp sensor harness plug
engine temp sensor harness plug
thats just what i know. might be more. the typical solution is to swap your intake manifold, especially if its going into a s13. theres alot of extra hoses and lines on the obd2 intake man that need to be removed. there's a decent bit of info on freshalloy... that's where i did my research anyway. (i did a 97 into a 95)