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yes it matters. If you have the wrong inlet and outlet possition the mufflers will not fit. I have Flowmaster 40 with a center inlet and because of them being centered I couldnt use them on my car. Make sure to get the right in/outlet ports or they will be useless.
well, if you are a 1.4 of an inch off, they can use an apadter to make it fit. but id buy a 2.25 inch in/out of you are going with the same size pipe (for stockish), or go 2.5 if you are planning on power adders.