Seeing as Chris has given us this wonderful tutorial on something a lot of us have a need for, I've been experimenting and came up with some additions to add. I was studying the curves of intercooler piping and found that they could be made from curved sprue pieces as shown below
These pipes are for those instances where you want to give the suggestion that the piping is connected to an engine in those kits where you have room to do so; not all models will allow, nor will they need this added detail but I offer the tip anyway.
I also added panel lines to the intercooler shown below...
I only mean to augument what Chris has given us and wish to thank him once again for sharing his knowledge with us.