I keep getting different answers on this. Does it really matter if the pipe you use for the mid-delete is 2.25 or 2.50? The original is 2.25 (right?) and is mandrel bent. If you stay with the 2.25 for a replacement, the bend that is put in it is not mandrel bent. So should you go with a 2.50 or keep the 2.25 because the the mid-muffler is gone so the smaller pipe is needed (for backpressure) to keep the flow about the same? Bottom line, does it matter which size?