Sound's like he's a tuner & on the right path...trial & error,,,I don't have the resources & haven't messed with any tuning since the "Carburetor" days....& reading plugs.../dang,getting old.
But i do know that fuel had to be removed from mine to get more power;I'm needing a sey of those Z1 Tuned headers & then back to see my boy's @Z1 Motorsports....ihiryu; you may want to phone Jon@Z1,as they are very friendly & i'm sure he will help you as much as he can.
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