When considering cost per HP gained, the obvious answer is a Supercharger. But as most said there is so much more that goes into installing a reliable supercharger. IMO you should start with the bolt ons then add the supercharger later on. Being that this is your first post I'm assuming you just got the car. Take the time to get to know the car with each added part. This way when you go S/C you will know if the car develops any issues.
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