Review on Heatshield Products 204014 Sleeve Roll by Raymond Gray

Use 1/2" to 3/8" fuel hose. The product is well made. I used custom fuel tuning on my Subaru. I honestly don't know if it will withstand heat loads, but the engines still don't get warm to 1100 degrees, maybe the turbo or the exhaust. I've done another Subaru with custom fuel lines under the manifold with no heat shields and never had a problem with them. I think this will increase the security of the hoses. The fuel lines look cool too. * The protective shield works like a Chinese finger trap, you have to push from the bottom and the top part detaches to insert the hose. Not difficult at all once you get the hang of it.