Best thing to do is take some time and do a little reading about turbos in general. Once you get to figure out how it all works and how the same turbo can be set up many different ways to have many different results, you might change your mind about buying a "kit". It is easier to just buy a complete set up ready to bolt on your car but it doesn't mean it's the best for what you want to do with the car. Inducer, exducer, A/R, boost map......it's all stuff that can help you make a better choice.