As far as the filter goes, no. But the factory airbox is in itself rather restrictive so if you can loose that, go for it. Besides, no one that looks under the hood of your truck will take you too seriously if you still have the stock airbox.
I replaced the stock-box wit the K&N FIPK. I didnt notice any huge gain in power either, but the throttle response was a hell of a lot better. Also being able to hear the air intake allows you to regulate your trottle better, as to not waste too much gas. I think the upgrade is worth the cost. Igot mine for about $230.