FMF power bomb pipe

I have one on my '04 YZF. I rode the other day with a friend who has the same set up. My pipe turned blue behind the powerbomb, where the muffler and header intersect. My buddy's turned blue right at the powerbomb. Should I be concerned? Is it running to hot, jetting issue, etc..? It felt as though it wasn't running as crisp as it was last year. Could it be first time out, colder weather? Any Ideas?

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