Lately I have had loss in boost and have been getting an engine light. When I clear the light I get my chipped boost back but after awhile i slowly loose boost and and eventually the car feels like I have less than stock boost and the engine light goes back on. Peridically i also hear a clicking sound from what I suspect is the turbo my acceleration is also not vey smooth its choppy when I hear the clicking. I have 62k on my car and I have a feeling the turbo bearings are having problems. My question is is it worth it to get the turbo worked on/rebiult? How much US$ does a turbo rebuild usually go for? Is it worth it to get a KO4? If I got a k04 what other parts would I have to get? Would a downpipe be necessary? Would a catback be necessary? How long and how much does a tpical k04 instillation go for?