They choke out modified tunes.The biggest airbox problems were the '94-97 trucks. The 99+ were ok, but the AIS is the way to go. Nothing lasts longer or filters better. Expensive, but worth it. :good2:
Admittedly it's been a few years since I looked, but last time I bothered to check the AIS flowed as well as any non-oiled filter on the market and there was only a marginal difference there. :unknown: It's possible, if not likely that the programmers have gotten more aggressive. I'm sure I'm missing it, but I don't see what year your truck is. In 2001 Ford moved from forged rods to powdered metal rods, but they've been found in some 2000 model year trucks as well. They're fine under stock power, but if you push them much beyond that it's easy to break them. Before doing too much power adding, pull the inspection plug near the oil filter and see which ones you have.They choke out modified tunes.