I have decided for you.
Do this
https://www.google.com/search?q=itb+plenum&client=ms-android-samsung-gs-rev1&prmd=isnv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiv7t7_7IbdAhVID8AKHUCKCngQ_AUICSgB&biw=412&bih=670&dpr=2.63#imgrc=YdZZkDLtdrN9GM:
Or get something like this
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F263868498704
Cut the end tanks off. Mount them near the trumpets and duct air to it.