Originally Posted by Nitrodyne website
We will include the ex system used for testing with each engine for comparison, however your results might vary unless you use the same ex system as we did during testing.
here's youre answer why theres a difference in power output.
The difference in power output is ...as i see it: they don't have the latest&powerful exhaust systems.
NOVAROSSI/Sirio/OS/etc. has.
If you run a .21 (for instance a 35+) with a 2006 you get a resonable speed&power.
the 2006 is released somewhere around 2002 or so.
When you mound a 2052 pipe you get far more power from youre engine.
I don't have hard HP results...only laptime
If you get a lower laptime with a different pipe you have more power!