turbo - good, definitely need a turbo in a turbo system
intercooler - good, although technically not a necessity, but i would recommend one
piping - charge, downpipe, return, ic, turbo locating (if not right off the mani)
manifold - you cant use a header for a turbo.. well you "can", but it wont be pretty
air filter - no.. not required. some people run them off the turbo
e manage - yes/no... e manage is a piggy back ecu system.theres Hondata, AEM, Ghettodyne, Uberdata to name a few
accessories to put it together...... yeah..... oil return lines, clamps, brakets, adapter plate, welder or jb or duct haha, going to have to run some vaccuum sources...more line, need to tap the oil pan
upgrade... injectors, fuel pump, colder (1-2 steps) spark plugs, possibly head gasket/pistons/rods/valves/retainers
other s**t: gauges, wideband o2?, dyno time, tuning cost
not to mention suplementary systems:: brakes and suspension....
btw... turbo d15b7 = BAD idea. Rods are so thin.