Like I said, you won't need to take the baffles out, the Epcos are plenty loud enough with the baffles in to drown out the valves. But if you want just something cheap with straight pipes the same diameter as the connection at the end of the header pipes, fabricating some stainless pipe is probably the way to go. I'm not sure though that I would be happy with a straight pipe as some back pressure is needed for optimum performance.
