i have some z1 silicone hoses (i think they are 5 ply) and are pretty damn nice quality, but seem a bit on the expensive side, and regardless what z1 says, dont get any silicone for any oil systems ,and z1 takes over a week to ship because everytime they get an order "their computers malfunction" and you have to beg joel to ship something. BUT their hoses are good and i've had zero problems with fitment on their fitted stuff