Tune up

U was wondering if there is anything else I can do to my truck to make it faster and give it more HP. Here is what I did so far:

- removed the factory exhaust and installed a 40 series single-in dual out flowmaster muffler.

- removed air filter assembly and installed a custom cold air intake with ram air assembly. Image

- changed spark plugs and wires.

- cleaned fuel injectors with sea foam

What else can I do. Does anyone know where I can order a MSD coil pack set and a good price? Thanks in advance.