I'm going through the same thing myself. I'm getting my turbo tuned for 300 hp also and have been wondering on gearing. I was running -1,+2 before turbo and have since decided to change back to stock gearing. I'm also curious what tire you fellas are running on street. I have always ran q2 but was curious what every1 else is doing with turbos. This is my 1st turbo busa. Im expecting to have it back by tue or wed of this upcoming week.