first of all it's plastic and the part which comes in contact with the engine is a loooooong way from the tb housing plus. so umm it might burn ur hand if you drive 3-4 hours straight. Theory, what theory?? i actually did it and felt it myself. the fact you live in thailand and thailand is quite warm, the engine bay is already hot on top of the grilling conditions over there.

ps: Australia, it is alot colder than thailand