I'm not sure if this has be addressed already in another thread, but it looks like the '06 4Runners have lost some horsepower and torque. From my recollection
2005: V6 - 245 hp, 282 lb-ft --- V8 - 270 hp, 320 lb-ft
The Toyota site shows:
2006: V6 - 236 hp, 266 lb-ft --- V8 - 260 hp, 306 lb-ft