2 of 4 pipes bluing??

McyMike

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On my Yosh TRS system my two right outside header pipes have turned blue. The other two (left) are fine. I 'm guessing I'm running lean on those two cylinders (but how?) can anyone explain?

PS: Running NOS, but it sprays in the center of the air box, not the right or left tube. Fuel mixture stays rich while spraying according to dyno sensor.
 
Johhny any ideas? No stacks. Fully modded air box with K&N. Pair is gone. On the dyno I showed
plenty rich across the board. I don't spray the NOS much (duration is only 2-3 seconds at a time) so I don't think the heat came from that.
 
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