Cutting and welding up the 3rd volume. It'll work much better if you can fab up a 2-1 pipe that fits inside the 3rd volume. It is more important for the 3rd volumes on the A's than it is on the ones on the D's, R's or Dx's since they are pretty much strait pipe 3rd volumes anyway.redline8100 said:i saw a dx converted to one stock muffler. was thinking about doing that with a tab pipe. didnt know if anyone knew whats involved?