Nothing to worry about. Although it is very small, every part in the exhaust system presents a little restriction to the flow of exhaust gases. The muffler you're looking at has less resistance than that of the original one, but to take advantage of that lower resistance, you also need to have other parts that have low resistance.
Right now the engine has to push the exhaust gases through two things, the catalytic converter and the muffler. Once you replace the muffler, the engine will just need to work a little less to push the exhaust out, that's all.
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Monday, July 13th, 2015 AT 5:59 PM