[PREMIUM TURBO SEAL KIT]: This set includes 4 high-grade rubber O-ring seals (part #11617801222) designed specifically for turbo collector intercooler systems in vehicles. These seals provide superior connection between turbo components, pre-venting air leaks that can reduce engine performance. [DIRECT REPLACEMENT DESIGN]: Engineered as an exact match for OEM specifications, these seals install easily without modifications. Replace your damaged or worn seals quickly to restore proper boost pressure and maintain optimal engine efficiency in your diesel models. [WIDE COMPATIBILITY]: Fits numerous diesel models including 3 Series (E46, E90, E93), 5 Series (E60, E61), 7 Series (E65, E66, E67), X3 (E83), X5 (E53, E70), and X6 (E71, E72) spanning years 1999-2014. Check vehicle listing details for specific model compatibility. [PROFESSIONAL GRADE MATERIALS]: Manufactured from quality rubber compounds that withstand high temperatures and pressure variations in turbo systems. These seals maintain their shape and sealing properties throughout extended use in demanding engine environments. [COMPLETE SOLUTION]: This package contains all four O-ring seals needed for a complete turbo collector intercooler system service. Replacing these critical components helps maintain proper boost pressure and prevents exhaust leaks for improved engine performance.