Why so long and funky (180 degrees)?. My induction AND turbo plumbing on my 930 does not add up to that and a lot of it is 3" in diameter.

To answer your question, the secret of any plumbing being the least restrictive on flow is to keep it big, straight and short.

2 out of 3 ain't bad, but from what you are describing you only have diameter working for you.