I can only address the aftermarket support (or lack thereof) for the engine itself as I own a Tundra as opposed to a Forerunner. What I have found for the engine is as follows:
Headers (short and long)
Some cat-back exhaust
Some complete exhaust
TRD SuperCharger system
Centrifical Supercharger system
Fuel pumps
High flow air intakes
High flow stock and aftermarket air filters
Piggyback computers
Jet reprogram of ECU
Fuel Injectors
Alcohol injection
MSD ignition box
Nitrous Oxide
Turbocharger system
Aftermarket spark plugs
That's about all I can think of at the moment. Word of caution....be very careful and conservative if you are going to add any type of power booster to the stock 2uzfe.....it isn't made for it. Do a search for 'grenaded 4.7' in the 'Tundrasolutions' Tundra forum or in the V8 FI Registry all the way at the bottom under Wayne Ryther in this forum and you will see what I mean. Hope this helps.
Wayne