Yes the shielding is welded to the pipe. Unfortunately, I installed them right before putting the car into winter storage, so I did not have time to scientifically measure the temperature difference, or get before and after logs. However, I did physically notice a drastic reduction in under hood temperatures after a spirited drive, as well as the cooling fans turning off significantly sooner than before (after ~2 minutes as opposed to ~5 minutes prior to install) however, there could also have been many other variables that could have led to the reduction in fan running time (i.e. lower ambient temperature, length of drive, etc.).
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