High Performance Series 3 Ply Polyester Reinforced Silicone Coupler Have Been Made to Survive Serious Boost Applications. Manufactured to the Top Specification and Utilizing 3 Plies of Polyester, We can Achieve a Continuous Temperature Range up to 500°F for Direct Turbo Installations and have Burst Pressures up to Over 200PSI. Hoses are Manufactured and Tested to Meet or Exceed the Requirements of the SAE J20 R4 Class A Specification. All of Our Hose Products are Made with a Super Slick Outer Cover. This Simple and Easy Design Promotes Easier Cleaning and Enhanced Look Under the Hood.