[ZLAYER]

I know that it has been accepted within the community that the stock uicp expands. But I wonder if that's just hearsay that's been passed down without question. I know the pipe will collapse when squeezed inward, but there is a material wrapped around the rubber pipe that, for lack of a better example, is sort of like seatbelt fabric. So unless someone has actual evidence, I believe there is no way that the fiberous material will allow the pipe to expand outward. I think aftermarket UICPs are just engine compartment bling. I will have no problem retracting my previous statement if someone can provide proof that expansion occurs.

 

[ZLAYER]

No need to explain I do understand the properties of having a woven material being much stronger but unlike carbon fiber there isn't a polymer binding that material together to help maintain its rigidity. Also that string and material does not want to hold it shape it wants to return its natural form which is a floppy string. The more you boost the more that rubber tube with woven mesh will want to resist that expansion, hard pipe there is no resistance or deformation of the material and if anything what deformation there is its negligible. Which would you find it easier to maintain a constant flow, a tube that maintains its shape or one that's shape is in a constant struggle of expansion and contraction?

In my original post I used a seatbelt as an example of a similar material. While I dont know if the material around the uicp is as strong as a seat belt, I do know that a seatbelt doesn't use a polymer binding. If you where able to wrap seatbelt material around the rubber pipe in the same fashion as the material mitsu used on the uicp, I would be shocked if the 20-30 psi that most of our turbos produce would be strong enough to expand the pipe.
Again, the stock material used may be far weaker and thus expand, but in the 3 or 4 years I've been on these forums I've never seen anyone produce proof that the stock pipe actually expands outward. I've only heard regurgitation of info based on here say.
No need for face palming. I r not went to colige dur!

 

[ZLAYER]

I can't say whether it expands or not for sure. But in terms of air flowing through an aftermarket uicp vs stock; I'm pretty sure there is a portion of the stock uicp that is reduced in diameter. Whereas the metal aftermarket uicp's are the same size the entire way through.. The section where it reduces down has to slow air flow to a certain extent anway.

The aftermarket pipes reduce in size too, due to the fact that the small side has to be the same size as the turbo outlet.