With the research I have done I have found that nobody likes our motors, and for some reason nobody wants to help make them any better.
There are tuners available for gains around 15-20,
K&N makes the only intake system I would put on my truck based on the reviews I have read on the other ones.
And then there is exhaust, which our options pretty much narrow down to just welding in a muffler that flows just as well as a rediculously over priced "full system", or pay a ton of money for a shiney exhaust that nobody is going to see and only hear.
Whatever you decide to do I don't see this motor picking up any more than about 30HP unless the aftermarket seriousley steps up there game.
I have been thinking about this for a while and for me instead of trying to add power I'm probably going to re-gear it to get the performance gains I would like to see.