Not Recommended for OEM Pipes, Hot Side Boots Available by itself here, These heavy duty intake boots are Four Ply Silicone and won't crack or split like the factory rubber boots. Features Heavy Duty High Temperature Four Ply Silicone Boots, Every boothose that Sinister manufactures is designed to exceed factory specifications, Wonrsquot split or crack like the factory rubber boots can, Increased airflow, quicker turbo spool, and lower EGTs, Kit Includes - (4) Four Ply Silicone boots and (8) Stainless Steel Spring Clamp, 300 Series Stainless Steel Spring Clamps., Burst rating of 400psi.