Currently:

Cortex Superchip programmer on 87 octane performance setting
K&N Cold Air Intake
K&N Performance Oil Filter
Flowmaster 40 series with 4" chrome tips
Custom Rims & Tires... 20" rims that are 9 1/2" wide with 295/45/20 tires (Too heavy for any v6!!) --- The rims and tires look great, but definitely added some weight on my axle. This really slowed down the truck off the line. Only benefit to the wider tire is the traction...

If you're thinking about putting rims on your 4.2L, go with 18" rims and only 8.5" wide.

Here is a video of the exhaust on this truck that my roommates and I put together. Please rate or comment with feedback, thanks!

YouTube - F150 Flowmaster 4.2L

Day light Pictures to come soon...