Harley2003

Are you saying it's not necessary to change the stock belt if you use the 4# lower pulley? Also, what intake parts are you referring to? I was looking at a package that includes the 4# pulley and belt along with the cold air intake that they actually call a "Mass Airflow System" It claims an improvement of 50 average hp and 75 peak hp. It sounds pretty impressive and not a bad deal for $700 IF it does what it claims. I'm new to the 5.4 world and only have experience with modifying 4.6 Mustangs. Is that package in line with what those who have actually modified Harleys are finding? I only want to do fairly light mods to the truck, but love free/cheap hp.

Thanks