Originally Posted by ilia@industry
Exactly. Dyno graphs are just too easy to change. If I tell you that the system has a 15hp gain, and you dyno it and it has a 5 hp gain because your dyno setup is different, I have a problem.
That's why we rely on backpressure to give relative figures.
I don't want to start a flame war but your explanation only further questions your honesty. How does one in the tuning business not know about the accurate and innacurate dynos? Like someone mentioned the Dynojet. If BMW dynos the car before it rolls off the factory to make sure it is up to spec I find it hard to believe that a company selling exhausts in the multiple K range cannot even do ONE.
Why post backpressure information at all if it's practically indeterminable to find out the resulting HP as you put it. The only thing I can guess is that there may be a performance loss and you don't wish to reveal it.
Sorry for the threadjack.