There aren't, but we're trying to grow. DSMtuners (original site) is huge and is the #1 place to go for DSMs. We're trying to make it the same for Evos. There are other Evo sites, but we try to keep it no-bull here with no vendors getting in the way of technical discussion.
You should be able to get just about any technical, modding, or power-related question answered here in great detail.
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