Running a WAI through the wringer

[spotaneagle]

yea also I bet your scion already recycles its heat to some extent due to newer emissions components, so you may have cooler exhaust headers to begin with, also I found that using purely plastic always produced results for me, but then again I wouldnt run plastic over my valve cover

plastic has less extremes too, it doesnt get as cold or hot, so less transfer of energy

get something similar your intake piping i used plumbing hose once and that worked, its clear and has thread in it, it absorbs alot of heat and heats air on the way in