I got my cat-back from Lou's Customs in MA. I got a stainless mangaflow. I belive it was around $250. I had them cut a custom tip to keep it up high and out of reach of rocks.
Get yourself to a parts shop. Buy a muffler that works well for a V-6. Go to a muffler shop for the install. Your done. If cost is a problem....Don't do it,wait.