Hello Paul and all.
  I complete the my first RX-8 13B p-port engine and I measured power and
 trq. This short lenght of intake dont good for me. Engine had cca 210
 HP /
 9000 rpm. Then I  used intake tubes cca 14.9 inch and engine had 257 HP /
 7500 rpm, but at 9000 rpm engine had only 222 HP. We used EFI euro 4
 computer. What should I do to that I have 300 hp / 9000 rpm? Because I
 used
 this engine in competition car. Thank ´s.

 Respectfully, Michal from Slovakia.

 Do you have a wide band mixture monitor on it?
 If so what was the mixture?

 Looks like you have the stock RX8 exhaust manifold on there.
 Try a header 32 inches long. About 1 meter.

 If you want to get really trick try something like this.
 Make the outer runners 32 inches long and the inner runner
 16 inches long. The theory  is the center RX8 exhaust port
 pulses twice as often as the outer exhaust ports.

 Paul Lamar

Hi Michal;

What is the size and timing and shape of your Pports?
Intakes size?

Paul already asked about the exhaust stack.  You probably want to tune
the 3 runner lengths, join the exhaust runners for scavenging as
straight out of the engine as possible, followed by a transition or
megaphone and a free flowing exhaust.
Lynn Hannover has posted details of his race setup in various web sites.

Cheers
Cary

Did Lynn run a P-port RX8 engine? I don't think so.
I think Michal copied our RX8-P-port youtube video.
He is getting about the same power at 7500 RPM we got
on the Mazdatrix dyno.

http://www.youtube.com/watch?v=NKJ00JsnS8A

Paul Lamar