i did the same thing at first on my 94 3.8. My advice is not to do it. Save a little money and get a dynomax or flowmaster exhaust. Ive got the dynomax and it sounds really nice when you step on it and also it has dual stainless steel tips. I did have to go to a junkyard and find the passenger side hanger for the dual exit. hope this helps a little.
I am running everything but the rear muffler. Its not that loud, sitting in the driveway revving it, it doesnt sound ricey at all. but under a load at just under 2K rpm it kind of starts ricing out. I was going to replace it since it rusted off of mine, but now im just going to get a turn down tip and leave it off.