Features: Engineered with rapid response technology, this high standard knock detects engine detonation in milliseconds, ensuring optimal performances and reducing failure rates by 15% for 4TEC models like , , and . Crafted from resistant plastic, it features accuracy calibration (±0.01mm accuracy) and direct fit compatibility with part numbers 420664031, 420664030, and 2410369 for seamless installation. Ideal for owners, mechanics, and enthusiasts requiring engine monitoring during high speed maneuvers or competitive racing scenarios. Performs flawlessly in extreme conditions ( 40°C to 100°C), safeguarding engines during aggressive acceleration, turn, or prolonged in saltwater environments. Rigorously tested for durability and resistance, this ensures long term stability across 2015 2017 models including 900 , WAKE 215, and 230, maintaining grade performances standards. Specifications: Type: Motorboat shock Part number: 420664031 420664030 2410369 0261231155 0261231218 270000484 materials: Plastic Color: As shown in the picture Applicable models: Suitable for 4ETC 900 130 155 215 230 255 300 Package Includes: 1 x Motorboat shock note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.