Hey Ron, it is potentially removable. The biggest issue the guys at aFe were telling me is that the engine compartments create so much heat that you would start sucking in a ton of hot air. That'd why if.you saw on the prototype, they had an opening, but on the dyno it did much better sealed.off. That being said, if someone wants to hear it and doesn't mind worse performance, then by all means, open it up.