I think it is angled in at least 45 degrees since that's about what the downpipe is at. Good idea on the setup, I think the only thing I might do different if I went that route would be to put a larger downpipe in since all the stock piping is undersized. I'd go with 2-1/2 or at least 2-1/4" for the downpipe and the rest of the way out the back.