i got given the pipercross induction kit which came with no heatshield, and my IATs went through the roof, then to top it off it lost 16g/s over the stock air intake, which amused me considering the ITG i had gained me 17g/s over stock. (both at stage 1)
if you reduce the temp of the pipework, the IATs will also reduce, so it can nly be a good thing IMO. just dont do it at the expense of the looks.. nothing worse than seeing an engine bay covered in bako foil