yeah, 4.6 dont have as many free mods, but then again have more power out of the box,

see with a 5.0, you can adjust the timing, TPS, remove the smog pump etc...

with the 4.6 the timing cannot be adjusted without an adjuster, the TPS could be but the housing doesnt really leave room to widen up the holes, and the smog system on the 4.6 isnt really a restriction of any signifigance.......

but just remember, when you do start modifying things, the 4.6 has alot of easy access to parts lines etc that are not so easy to acess on a 5.0, the 4.6 is alot easier to work on than a 5.0 IMO but then again, everything costs twice as much.....