After many long chats with a Yam dealer who owned one of these he got a lot more power out of it with Akro cans, K&N and a power commander. There is also the "Kev mod" which works on some of the XT660 setups which is cheaper than a PC3. He said the power gains were significant. My brother has an XT with the same engine and same mods and he did indeed ring a lot more power out of it.
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