It would be interesting to see them do a dyno test on the same filters, on the same truck, same day etc. And then post all the charts versus giving us an "opinion" that it did not increase horsepower based on seat of the pants or what ever criteria the author seems to want to push. While I don't doubt that peak horsepower is not changed or has very little change, I am curious about power changes in the lower rpm's and mid range due to less restriction to air flow. I am thinking when a piston starts moving down its like a syringe having to suck the air into the chamber. When using real syringes less restriction means easier to pull with less effort, but still thinking it got the same amount of air. The air just moved slower and took more energy. So how does this translate to engines. Different people always give me different opinions and experts seem not to all agree. So for me I would like to see Dyno charts on the same truck, same day, etc to see what difference the reduced restriction makes in a controlled manner and not just an authors opinion.
2005 GL1800ABS 62,000mi
2003 ZG1000 134,000mi