I need to put a new cat back on my 84 l69, someone put a lg4 cat back on it long ago. I was thinking of getting the dynomax system from Jegs for the 84-85 which is 2 3/4". My question is, will the 86-92 single cat system fit? I believe this has the 3" pipe. I can do a little welding and fabricating but i dont feel like making a big deal of it.