This Spectre intake tube allows you to create an intake for almost any application by connecting two 4 inch outside diameter tubes or air intake components together. The intake tube is 4 inches in length and made from polished aluminum allowing components to be welded or booted together. This product is not C.A.R.B. exempt. Products that are not C.A.R.B. exempt are legal in most states, but may not be used in California or states with similar emissions control laws except on pre-1976 vehicles.