Had to look those up. 10HP is pretty good for the intake velocity gain they give. Maybe it is the percentage of gain, but 10 HP isn't something people normally feel in the seat of the pants. Wasn't saying it wasn't there, but feeling it is not something most can do.Just got back from the dyno shop. Original horsepower before free flow air filter and power blocks was 154. This morning measured 165. Numbers don't lie and both of my mechanics and I all felt the Improvement in driving it after the power blocks were installed. Gave me exactly what I was hoping it would - just a small boost in power. God I love that car LOL. There are other examples online showing Dyno runs before and after power blocks. Once the warranty is fully up I will probably have the Colorado guy do a tune for me.
I could "feel" 20 HP gains on my bike, but never in a car or pickup, and 20 is a lot more than 10. Maybe I'm just not sensitive enough to it.. LOL
Where did you get them? Link? $300 isn't a bad investment for 10 HP.