[Gigaherz]

you have to use a mustang tps...

if you block off the exposed part of the iac channel in the bottom of the tb then you don't need the tube otherwise yes you need the tube. You can fill the passage and then drill out the hole for the iac. IT has to be sealed otherwise the iac won't do anything and the car will idle really high or the compter will go nuts trying to keep the rpm's down somehow.