All i know is i am at 10# and when i take it out i run it pretty hard. No problems with the engine at all had it on for about 21,000 out of the 23,000 miles on the car.
That is my buddys car they tried it on and he had nothing bad to say about it. It helped out his problem. He goes by turbotungsten. Unfortunitly he is out of the country for a while.