So I have a 2 1/2" cowl hood on my truck but I am still using the stock underhood liner/insulator. Was wondering if anyone has found an aftermarket liner that goes in the stock location that will allow air flow thru it, if not I am going to have one made up...

 

I've had cowl hoods on several trucks in the past and I just chunked the underhood liner and painted the underside of the hood to match.

 

I know most of the Dynamat type companies sell a specific cut to fit product for lining your underhood.