The NRW Design S65 Billet Block-Off Cap is a premium CNC-machined replacement for the stock plastic accessory block-off caps found on the BMW E9X M3s S65 V8 engine. Crafted from solid billet aluminum and finished with precision, this block-off cap eliminates the weak, brittle OEM plastic parts that are prone to cracking and leaking over time.

Perfect for performance builds, high-temperature environments, or engines with upgraded components, this billet cap delivers improved durability and a clean, engineered visual upgrade for your S65 engine bay.

Features and Benefits

• CNC-machined billet aluminum for superior strength and rigidity
• Direct replacement for factory plastic S65 block-off caps
• Cleaner, stronger, and more durable than OEM components
• Precision fit designed for S65 engine accessory ports
• Engine bay upgrade with motorsport-inspired aesthetics
• Ideal for performance, racing, or high-stress builds