What is the clear lid?

Basically, the lids that are most common for our cold air intake enclosures are black, along with a black base/body. However, they're also available with a clear lid option, allowing the filter to remain visible. To give you an idea as to what the clear lid (and body) version looks like, please check out the link below:

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/CAI619