i am getting my dad's 1999 F-150 in about 2 months and i am planning on putting the RCD 6" lift on it with 35" tires. i also want to put a K&N intake on it, get a superchip tuner, gibson dual exhaust,and gibson headers. i wanted to know what the best upgrades for maximum power and torque gains are for the most reasonabe prices are. i was also wondering how to use the propane set up and if it gets better fuel milage than gasoline or not. thanx for any info.

 

ASP Underdrive pullies are good for a lil HP gain.
The K&N intakes are good too