I'm using the bstc from ramchargers and like it alot. Using the 1 factory soleniod it gives you about 7 psi adjustment from where you set your wastegate rod from. But if you use 2 factory soleniods like I do, you can get about 15 psi adjustment. It's great because you are able to adjust boost on the fly. No more need to pop the hood and burn your hands trying to get the boost just right.