Concur 100%. Make everything long by a foot. One problem in particular that I found was that often the inlet/outlet of my mufflers are timed just in one way. I would turn the muffler to wherever would give me the proper positioning of the outlet pipes, so they would fit in the top deck cut outs. Then I do what is necessary to make the bottoms meet up with the straight pipes.
All this is assuming you do not have left and right NOS mufflers.
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