Ok as my signature says i have a custem exaust (doing the first half when i do my next oil change) and a K&N. So whats my next step to get a little more out of my 3.9? I do a bit of off roading but it is my only veichle so it needs to be drivable. Im thinking throttle body spacer like this one. http://www.jcwhitney.com/autoparts/P...002034/c-10101

Is that 20hp claim a load of crap? Or will i get a better bang for my buck on a cam? Now i know that i need to burn more fuel to get more power but im not looking for a lot. I do want a decent MPG still but i know its gonna go down a bit.

 

Don't get a TB spacer. Here is an article, which the user "The Burning Rom" provides in his signature.
As far as other ways to get more power, I can't help you, but I know other people around here can.

 

Thanks for that tidbit of info. I would still like to pole the masses but because of that i will proly be looking at a new cam instead. And by cam i mean cams

 

I also have a 99 3.9 and I have been looking at these Crower 1.7 roller rocker arms http://www.truckperformance.com/prod...ber_CRO73654K/
They are supposed to add 15 HP and 20 ft/lbs torque. I am planning to order them early next week.