Adding a turbo to a non-turbo engine....

I have a turbo im taking off another car and im wanting to put it on my 2001 eclipse.. I've been told my compression must be changed to add a turbo...is this true? or will a kit be all i need to innstall this turbo...or would i be better off ordering a whole new turbo and kit? Any help would be much apreciated.. Thanks people!!
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Divine Wind

what kind of turbo is it?...youll need to do away with your header and get an exhaust manifold,supporting mods for it,electronics to run it and also....possibly a mod to your ecu,i dont think they make turbo kits for the 3g.your looking at alot of money.