Jwt 530BB are about a grand more. But what you have to decide is if a grand is worth a little more horsepower and the design of a BB turbo. But what you should also consider is getting some manifolds from specialtyZ. They are expensive but will allow you to get all that you can out of the turbo. If it was between 500's and 530's. i would say go with the 500's and manifolds, you will get much better results. That is probably what i am going to be doing when the times comes.
