Dirthead, that is NOT the same as INTENSE tubing. I know. I searched McMaster and alot of other sources to help a member find it in 3", and it wasn't easy.
Your tubing will coil bind and cause turbulence long before INTENSE tubing does.
Let'* see you put a 45 degree bend in it and shoot another pic from the inside.
The tubing you found has a bend radius of 1.75". INTENSE tubing has a bend radius of nearly a foot. When tubing like this compresses, the compressed material has to go somewhere. Half of it coils up INSIDE the tubing. The tighter the bend radius, the weaker (and more restrictive when bent) the tubing is.
The McMaster tubing is about as similar to INTENSE tubing as your underwear is to your socks.