Glowing header

got an 01 yz426 off a guy I know that needs some tlc. Got it to run in my garage today but after letting it warm for 2mins I noticed the header pipe was glowng red hot were it meets the engine. Any ideas why it would glow like that so quickly?

they all do it

Mine is more impressive when we go to the sand dunes and I do some night riding around our camp. My header will be bright orange all the way around the bend. Kind of freaky

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