You will need extensions for your o2 sensors. Alot of places sell them, or you can make them yourself if you have a source for the connector and wire. As for the hardware and gaskets, I'd recommend stainless bolts and a non copper gasket. I've been through about every gasket made for our cars and by far the worst was Mr. Gasket's Ultra Copper (leaked like hell). Gangly is right about the bolts backing out, so I just went to the hardware store and picked up some lock washers, and they work great. I ended up going with the stage eights as well, not really because they are locking (PITA to set up), but the heads are small on them, I think 11mm. I never had much luck using the allen head portion, especially on the back ones. Instead I visited the Mac man and picked up a special wrench. I cant remember what they are called (maybe distributor) but it's an open end wrench on both ends where one of the ends opens at a 90 degree angle. Works like a charm for install on these headers and well worth the price. Other pointers include, get the car up as high as you can on jack stands, pull you spark plugs (so you don't break them), make sure the o2 wires are routed away from the exhaust, and i think the passenger side goes in easier from the top and drivers from the bottom (cant remember but don't force them they will go in). That's all I can think of off the top of my head. Hope this helps.