Bakers Precision sells them. I just got my 3 inch coupling hose from them and it looks pretty good. Orders are custom made so it does take some time for things to show up. Personally I went with 3 inch piping so I only had to buy one "boot" or reducer as they call them. However, if you are moving your TB, you should probably go for something like 2.5 as I believe thats the size of the TB. Choices are kinda endless really. But I bet the 2.5 fits easier. I'm gonna have to cut off part of my alt bracket I think.