I just used the jdm dohc zc oil pan that came with the motor, I couldn't use the zc exhaust manifold because of the 4-2-1 design, where it merges into 2, there isnt enough clearance to clear the front diff. Soooo for now I'm just using the stock exhaust manifold off the sohc D16, its a 4-1 but merges into 1 before it even bends 90 deg to go under the oil pan, basically choking it haha I bought an ebay obx knock-off 4-1 (the one for $49.99) but the welds were so hideous I sold it locally on craigslist for $40 bucks brand new because I wasnt about to put that crap on my car...hmm I really need to figure out a better exhaust manifold setup though....
The exhaust system I find that works the best is my HF mani to custom built adapter plate (I'm a machinist) to IHI Subaru XT/Loyale turbo. Exactly whats going on mine when I get my old ZC back together.
4WD, check out the sticky on the DOHC ZC conversion in Engine & Drivetrain - cheap and easy 4-2-1 setup that clears the sump and matches exhaust ports.
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interested in the mice that used to run your car....