Im a bit confused RaseR, how are you going to keep the existing airbox and use the air feed from below? As said by Bunta, feeding from below the airbox (and would need modifications to the air box) will by-pass the filter. What ideas have you got for ducting the air in with the second snorkel so it will pass through the filter while retaining the stock airbox? What your suggesting only looks like it will work if your using a pod filter I would think.
EDIT: Also if you still running the stock IC the return pipe will be taking a lot of the room to play with below the air box. It looks like to me the UAS pipe feeds up to the hole where the stock return intercooler pipe would have been if your running an aftermarket intercooler whose return pipe goes over the engine/fan. I don’t think I have explained that very well, I hope that makes sense. Unless someone has an idea how to make it work?