They are pretty good for the price. If you don't want to spend a lot of money, look at a replacement filter from K&N or another company. The stock airbox isn't terrible on these trucks! There are a few people working on tube replacements also to save money on a complete intake swap
There are a ton of people satisfied with just a filter swap in the stock box.
BUT...I did spend 350 bucks on my new Vararam intake last week