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It changes the character of the car in the sense that it makes it legitimately fast, and you have to be more careful with it. It basically does the same thing to the power delivery that good sticky tires do to the handling. It takes it from 'fun' (a nice way of saying slow but reasonably entertaining) to actually being a serious performance car, and of course that changes the way it feels and reacts to inputs.
Bolt ons will make a bit of power, but they're not going to make the car seriously fast. They're noticeable, but it's not night and day. With a tune the pick up a bit more and it becomes better, but it's still a pretty slow car by today's standards with ~190-200whp.
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