Spoiler,


You can get a [link=http://macspro.com/tunedpipes.asp]Macs[/link] tuned-pipe, but the cost is humongous...

Of the pipes offered by Macs, in your particular installation, there are several choices:

Quiet pipes

7.5cc (.40-.50) 16½" 3.4 oz 77.95 1040
8.5cc (.45-.60) 16¾" 4.0 oz 92.95 1050

Tuned pipes

7.5cc (.40-.50) 12¼" 2.0 oz 47.95 1140
8.5cc (.45-.60) 12¾" 2.0 oz 52.95 1150

And Muffled tuned pipes

6.5cc (.35-.45) 14¼" 3.4 oz 65.95 1230
7.5cc (.40-.50) 15¼" 3.6 oz 66.95 1240
8.5cc (.45-.60) 16¾" 4.2 oz 75.95 1250

For a Diamond Dust you would want the maximum RPM, so the shortest pipes are in order.

The 1140 will give you the highest possible performance, but believe me, you don't want to hear it...