Guys, read page 42 of Motor Trend (Aug 2005):
"The Society of Automotive Engineers (SAE) recently revised the rules for measuring horsepower and torque and introduced a new standard for certifying said numbers..."
Overall, makers of cars, trucks, vans, SUVs etc. may voluntarily undergo the new standards so the horsepower ratings will more than likely drop. It's the same engine, but different numbers.
"The point of the revision is to account for new engine technologies and to reduce the opportunity for liberal interpretation."
The first vehicle to be tested to the new standards was GM's Chevrolet Corvette ZO6 with the LS7 V8. Under standard testing, the horsepower was 500. Under the new standards (called "SAE Certified") horsepower was rated at 505, a 5HP difference.
Overall, this "certified" rating is supposed to be more accurate.
"Manufacturers committed to reporting accurate, representative numbers all along won't be affected by the changes. Conversely, any manufacturer that lowers its output ratings in the near future will be under suspicion of having gamed the system."
Therefore, anyone that lowers output figures significantly basically means they were lying to us all along.
"Inviting a neutral third-party SAE witness to certify an engine's output is the surest way to dispel doubts and win consumer confidence...The certified output must be within one percent of the dynamometer output...but by certifying an engine the manufacturer guarantees all production engines will produce within two-percent of the rated output (Europe allows five percent deviation."
So that means all engines will be proven to have similar horsepower (so the company can't claim one number when in reality you have less horsepower).
If that's the case, Toyota is going the SAE certified route with the 2006 Camrys.