If you want a kit that is street legal and a complete bolt on, buy Greddy with the intercooler upgrade, you will run mid to low 13s on street tires with that kit with no additional tuning.

The Drag has shitty fueling, the RevHard is nice (I have that on my car) but the kit is not as complete as the Greddy but has much more potential in terms of flow, the turbo will flow up to about 450 to 500 whp. The Greddy turbo is smaller but much more drivable on the street.

Do research and think about what you want a year from now and will the kit suit your needs then?

Think seriously about tuning with standalone systems, that is usually the biggest downfall of turbo kits - lack of tuning - such is my case (not for long)