If you’re running a V8 LS/LT, this air box allows you to get a lot more air flow. 4 in intake and exhaust ports and a free flowing filter. In testing this box drastically reduces vacuum from filter to intake. Includes AC Delco filter (2001 Silverado Duramax air filter).  We have adapter brackets for FJ60/62 and FZJ80 Land Cruisers.