THanks for the input on the 261C. I was emailing engnbldr and he also thought the 261C was the right camshaft for my situation. A 2nd opinion is always nice.

Given that I have a 5 speed manual transmission I am just not quick to jump on the concept of regearing. My 4Runner does just fine at highway speeds until I hit a hill or a strong headwind. I can always downshift to compensate but the lack of power is still an issue. Even at 4500 RPM the 4Runner is not capable of acceleration going up a hill at highway speeds. If I could find used 4.56 differentials for a reasonable price I would do it in a heartbeat but the cost of buying the ring and pinion gears and having them professionally installed is a small fortune. I would rather put my money into lockers and camshaft. As for my exhaust it really works fine the way it is. And adding the 261C camshaft should make even more use of my expanded exhaust. I still dont have a feel for how much horsepower I will get with the new camshaft. 2HP? 5 HP? 10 HP?

The other mod (or perhaps its considered a repair) is to replace my fuel injectors. My gut feel is that I am not getting a good spray pattern. By the time I get the intake system apart I may as well replace them given the effort/time involved. I havent yet heard of any easy way of testing them on the vehicle. I dont have any equipment for such a test.

As for my vehicle lift I disagree about suspension lift being wasted. My rock crawling adventures usually are very technical and the extra clearance is a huge bonus even if the differential is not raised. That being said I know the body lift is of little use. I believe it would help the aerodynamics of the 4runner if it was lowered close to the ground. The aerodynamic difference is minimal when we are talking about the rocker panels being 20" or 22" off the ground. The best way to improve the aerodynamics of any truck would involve having a smooth, flat, lightweight panel covering the entire underside of the vehicle. I have a 21ft motorhome that is designed like this. It is completely flat (the underside of the vehicle) from front to rear and gets 20MPG. Yes, a motorhome that gets 20MPG. Toyota could learn something about aerodynamics from the Vixen Motorhome company.