the guy did a great job!!!!!!! i told him what i was looking for and when he cranked i smiled from ear to ear. I tried 3 setups and this by far is the best i've ever heard on a 4.0. I'm gunna try to get my hands on a video camera to post a youtube link. I told him i wanted aggresive but not so obnoxious. he nailed it. All i know is that it's a dual chamber flowmaster. No idea on the series. I'll go back and ask if anyone wants to know. when i crank it, you would really think it had a v8, and it holds that tone up to about 27-2800 grand. and it doesn't aggravate me in the cab since i got it going out the back. ran me $250 cash. just snapped a few pics, i'll try and get some better ones in the daylight.
i know about the deatails. i may still have the invoice in my truck, he may have wrote it on there. I let my buddies hear it when we left school today and they were very impressed (we are very brutaly honest with each other too) so i guess that's a good thing.