Hi, I'm going to be changing out the oil pan gasket soon on my SOHC ZC in a 90 HB Civic. I just took a quick look at what I need to do. 1. Move the exhaust 2. I think I have to remove some bar under the engine. I was thinking about just unbolting the exhaust manifold and hopefully this will drop the exhaust enough to remove the pan. Any tips in removing exhaust manifold bolts? I would hate to snap one off. I'm assuming that I'll need to replace my exhaust manifold gasket (even if it's less than six months old) [CORRECT?] Also I was thinking about switching to my ZC manifold which is a 4 - 2. Would it be worth it to upgrade to 4-2-1 exhaust setup?