Mine runs well, but since i put the Leo Vince exhaust it pops like crazy to. I don't really mind the popping, but if the O2 trick can give me a couple HP extra i'm up for it!
Do you guys think it's safe to do without spending money on a dyno? Over here a dyno is very expensive and if i can do without it i would rather keep my money.
After a good run, what do the plugs look like as far as the color of the porcelain? I know it can vary by fuel but you might consider the AIS block off plates. They're making it reburn in the exhaust by adding extra air when you let off the throttle. Or you could just unplug the solenoid and see if that helps.
But, free power is never a bad thing!