The tube that I used was 3"
The intake manifold is 3 1/4"
There is lots of ro0m for a shield for the intake I will send you lots of pix
If there is anything else that I can help you with just let me know
-also you should try and make the IAT closer to the filter for a colder air reading( this suggestion came from somewhere??? I forgot) And by doing this you might have to send a relocator for the IAT with the intake as like a package deal, this will cost more I know but mabey this will help overall, correct me if Im wr0ng( Im still new to this)