Elevate your engine bay with Billetworkz premium billet aluminum engine bay caps and covers. Our precision-engineered, CNC-machined caps are designed as direct replacements for your factory plastic caps, offering superior durability and a custom appearance. Available for Subaru WRX, STI, BRZ, Toyota GR86, and more. Each cap features our signature engraved designs and is available in multiple anodized colors to match your vehicle's aesthetic. Transform your engine bay with automotive jewelry that combines form and function.