For the shutoff:
Get some cheapo vac tubing
Go to the pharmacy, buy a 5cc or 10cc syringe (think dropper feeding kittens sized, has a blunt tip)
Connect to the shutoff vac pod on the IP, route into the cabin. BAM, in cab shutoff.
For the intake, I'm pretty sure you can get smooth transitioned silicone piece from eb*y instead of the sharp angle (although that is some nice welding)
Or break the bank and buy a "donut" to make a complex sharp transition that flows smoothly. There are several OEM filters from Fords & GM cars that can be stuck on the end of a pipe easily, I don't remember the numbers offhand but they're around the forums. You can always browse the wall-o-filters at the parts store.
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