2020-2026 GM 3.0L Duramax Carbon Fiber Air Box Lid LM2/LZ0Duramax Carbon Fiber Air Box Lid The PPE Zilla Carbon Fiber Air Box Cover is an exceptional upgrade to your GM 3. 0L Duramax. Its handcrafted from 100% genuine, dry prepreg carbon fiber and finished with a sleek clear coat such high grade materials and craftsmanship are typically only seen in supercars. The PPE Air Box Cover not only boosts performance but also adds a striking look that sets your Duramax apart from the rest. Unlike competitors air box