Re: iForce V8
The 4.7 V8 in my rig and many others is an iForce. I have copied specs from the 2003 reviews below:
Alternatively, 4Runner now offers a 4.7-liter i-Force V8 engine on all models. The powerful V8 produces 235 horsepower at 4,800 RPM and 320 lb.-ft. of torque at 3,400 RPM. 16/20 mpg for all 2WD models and 15/19 for all 4WD grades is not as good as the other engine but this one has nearly 40lb-ft more peak torque.
With my Magnaflow Cat-back exhaust system and TRD Air Filter, my numbers are bumped up a little bit to 255hp and 340lbs tg.