Genuine OEM Audi Intercooler O-Ring, part number 8K0145117B. This O-ring is essential for creating a tight, leak-free seal at the intercooler connections, preventing pressure loss in the intake system. A properly sealed intercooler system ensures optimal engine performance and efficiency. Using genuine OEM O-rings guarantees the correct material composition and dimensions for a perfect seal, crucial for maintaining boost pressure and preventing costly repairs.