1. When at 6k+ RPM do you often find yourself feeling that the car is too slow?
2. Do you have $17-22K sitting around and not know anything better to do with it? (If you can do the work all yourself you can save around 5K off that.)
3. Do you usually have $5-10K available if the worst does happen.
4. Have you ever actually driven your car to it's full potential? Track/Autocross/etc.?
If you answered yes then FI is a no brainier.
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