Header wrap on crossover?

[Bio248]

how long does the air sit in the throttle body to absorb heat?

[Agentlongwood]

Gotcha. So then the heat shield ZZP sells for the TB is also kind of a waste right. Forgive my noobness but what does a TB spacer do. Is blocking off the coolant passage in the TB also a bit pointless or is that for something else?