What is the year, model, and engine of the vehicle in question?
What size are you looking for, diameter, length, volume, etc..?
Exactly what do you mean by intake tube? Throttle body, piping, intake manifold?
chysler 300c 5.7 v8 want to no what is th diameter of it im trying tochange it out
The diameter of the throttle body is 3.5", so I would recommend replacing the intake with one that has a diameter of at least 3.5".
I hope this helps! Let me know if you have any more questions!