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Regardless of what people at K&n say you may need a tune to run there kit. You run the risk of running lean. I am assuming you have a gas truck as you didn't say. Its better to be safe than sorry. Some guys dont check there A/F ratos and its just a matter of time and boom.
Either way, I've ran various cold-air Intakes over the years & still do.
Plus I had worked in the Industry for a few years & IMO cold-air Intakes do work.
Although, how much depends on vehicle application as well as what else has been modified or how tuned.
If it's a Diesel, I do not recommended K&N, get a S&B Intake