Ken,
I have a 1998 F150 4WD with 5 speed tranny. Computer Code NLK2. Will I be able to feel a difference in power with a chip installation or will it be more like the addition of Flowmaster Cat Back duals and K&N air filter? (no real difference felt, just have to "trust" that an improvement occured.) I won't even experience the difference of firmer shifts that the guys with auto trannies get. I don't neccessarily want "drag strip" performance, just a noticable power increase for off roading and pulling my 21 foot boat.
On the Diablo performance gains page, there are two different 4.6 engines listed- a 4V and a 2V. How do I determine which engine I have?
Finally, which chip, (Diablo or Superchip)would you reccommend for me?

 

It will be a real, noticiable and usuable gain, not a "I think there is a gain." Having said that, don't expect supercharger performance for 1/10th the cost.

Ever drive a compact car uphill with the AC on? Performance sucks, doesn't it? What's the first thing you do when you need more power in a weenie car? You turn off the AC! Well, the chip performance gain will be like turning off the AC in a compact car, but even more so.

You have a 2V in that truck.

Most HP bang for the buck, Diablo, but you'll need a very good quality name brand gas.

 

I can get 93 octane from Exxon/Mobil, BP, Shell or Union 76. Is that what you mean by quality gasoline?

 

Good name brand. You'll also find that depending on local gas formulations, some brands work better than others. Chevron seems to be universally good.