Most performance threads end up in a horsepower discussion.
.. there is a dyno number which means no.. fan,water pump,alternator,
fuel pump,air cleaner or exhaust and usually through open headers.
There are several different was as well as several different ways the dyno calculations are done. The American way, the European way, the Japanese way. And I goes on and on.
Let the track be your guide?
That may not even be accurate. Why?
Is your car maxed out for track runs?
If not, then it is not accurate.
Find a rear wheel dyno and run it on that. It will work well enough. Let the shop tell you how much power is lost through the drivetrain.
