That's going to depend on which Turbosmart BOV you already have. If you have a newer unit with a 90° adapter, then you can select the OEM BOV fitting and be fine. If you have an older unit with a straight design, then you'll need to choose the Turbosmart Flange in order to clear all the tubing. Give us a call directly at 623-434-5277 so we can get more specific about the Turbosmart Kit you have.