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I wouldn't eliminate your rev limiter. You can get a new ignition such as MSD and that will enable you to raise it. Do you have your internals done? I wouldn't raise it too much w/o internals. Oh, I've heard that if you get a mugen computer chip that will raise your rev but I'm not sure on that.
after a certain RPM...you are just dragging out the gears...which you will eventually not gain speed...your going to have to roll on a dyno and get your ecu chipped.