Jwt is flashing the computer to run my setup it's out of a z31 vg30e not a dohc, the exhaust is the least of my worries.i am using d21 manifolds and they fit like a dream. For the oil pan I am running the z31 pan and moving the cross member forward a little. I got the engine as low as I could. As far as the steering I just flipped the center link over re drilled and sleeved the idler and pitman.