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you probably won't notice too much of a difference in anything really even though on a dyno you might have a few different numbers, but i would think nothing substantial. I would just go with duals so it looks betterOK, so after lots of searching, I found a set up I kind of like. A video on you tube had a ImpalaSS with a single Dynomax bullet muffler and dual pipes out. (another vid of the same car showed a single pipe though too) So my question is would going with a single muffler hurt performance or fuel econmy versus staying with 2 mufflers, and would 2 mufflers make it sound any diff from just haveing the single muffler?