- with a turbo setup you have a boost controller. you can make whatever boost level you want (also depends on what size wastegate spring is installed), but depending upon the efficiency mapping of the turbo you might be pushing it too hard or not hard enough.
- you cannot put a turbo on your car without a whole slew of other things to go along with it. it is not a bolt on part.
- the turbo is cheaper because its more of a low end turbo. high end turbos can cost well over $3k for just the turbo.