I have a 3" in, 3" out flowmaster 3-chamber muffler. I run Doug Thorley headers and no cat. The muffler has the outlet on the right side with a spot on the left that looks like it is for another outlet. Could I use a hole saw and cut out the spot and weld on another turn-down? I want it to be louder and free-er flowing, this would be a cheaper alternative to getting a 2-chamber or a 1-chamber. Any thoughts, or does anyone have a 1 or 2 chamber muffler that they don't want anymore??