ScottyP5947: did you install the straight pipe or the Walker?
When you say you wish it quieter at 1600 rpm...is that with the windows open or closed?
My local muffler shop only has 3" pipe...NOT 3.5". Spoke to them today and they told me "no real difference downsizing to a 3" in that section". Not real sure if it will make that much difference to go smaller as I will only be using a DP Tuner and open intake. No real heavy hauling needs for me.