This is a stronger alternative to OEM hoses and in most cases with better airflow with its smooth inner layer! These hoses have a 4 PLY reinforcement and integrated steel wire to prevent the hose from collapsing under negative pressure. Another advantage of these hoses is the silicone material that withstands high temperature for long time.These hosekits are a terrific upgrade if your original hoses start to crack from age or maybe you use your car in a way that the original hoses where not designed for.This hose kit is available in two different colors Blue / Black. There are no performance difference between the different colors, choose which color you think will be best for your car.Note, the fastening for the idel control valve is not built in this hose.