How much for 2.5 dual exhaust on a Duster

Go ahead and use the X pipe kit from Jegs. It works well and
doesn't cost that much. I bought my X pipe from them a couple
years ago. Then this past spring I added the cut outs on after
the X. The new X pipe setup they have has the cutouts before the
X. Good in a way. But if you put them after the X you get the
full effect of the power gained with it.