Like I already said in the dyno & drag section, you're aif fuel sucks. On our cars, if you measured air fuel at the tailpipe you need to lean it out. I was running 196HP last summer at about 12:1 A/F, and I leaned it out to 13.5:1 with no sign of pinging. I gained 10Hp.
Your engine looks like it has a breathing problem, like someone mentioned, its choking off around 5700 when the torque should remain higher. Try running the dyno with air filter off for one run, then alternately try running with pipes down at the y-pipe to see which one is the culprit. Don't be surprised if you jump up 20 HP or more with the exhaust pipes dropped.
What kind of catback do you have? What size valves did you run? Porting job?



Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black