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Marty, I have the same year and engine but a tacoma 4x4 PU with manual transmission. After reading a variety 4x4 forums, it appears the header-exhaust provides minimal mpg gains given the cost of investment. The stock header, as you might have read, has a tendency to crack. Mine has not, but that might be the time to swap to an alternative. Personally, so this is anecdotal, I have found the greatest gains simply by better shifting, keeping highway speed down, and using much less aggressive tires. Regarding the CAI, a simple mod is to open the airbox and grab some of the cool air coming in from around the headlamp. An opening is cut into the airbox below the filter. This opening can be "framed" using PVC and a screw on cap or by using a "boat deck" plate. This allows you to reseal the airbox should the need arise. Some have also removed the metal spacer from below the headlamp to facilitate the cool air intake. Finally, if you have auto locking hubs, you could consider adapting to the manually turned hubs as this will allow the front axle to completely freewheel reducing parasitic drag.
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