Personally I am a penny pincher and can relate to wanting bolt on parts...However I have found (recently) that the local exhaust shop can replace the entire system from the cat back for not much more than what I paid for my muffler. Just a thought but might check into it...very difficult to repair leaks if you wwld it yourself and are not experienced...not saying you can't handle it, just a thought.
For example the muffler I was going to purchase alone was 85 bucks, and the quote from the local place was 125 including replacement "turbo" muffler and complete tailpipe assembly installed.
To me it was a no brainer.