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Well before i bought it like 3 weeks ago, i noticed there were no mufflers on it. It doesn't sound too bad really.....I kind of like it but there are some times where it gets some annoying pops.
why the hell would your motor "need" backpressure? you want as little backpressure as possible in your exhaust, because all backpressure does is rob power from your motor having to work harder to expend exhaust gases. if an engine needed backpressure, then race cars wouldn't run open exhaust.