I remember awhile back seeing a post on modifying the factory airbox by drilling out some holes to let it breath better but I can't find it. The post showed pictures of where the holes were drilled. If anyone can help I would appreciate it, I am doing this on a 05 LLY and only because all info on the aftermarket intakes leads back to the factory intake performing the best.

http://www.wackywack.com/dmax.htm

This is Nick(the founders) site. Scrool about midway down.

kennedy diesel has a great article on their site!