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Mopar doesn't make a PCM for your engine, but you might be able to get a new chip (PCM) from an aftermarket place... You'll need to find out from the induvidual maker of the product, what exactly it'll do to your engine... what benefits you'll get with it...
you can have yours custom flashed, which would do the same as a mopar performance PCM. Jet chips are "supposed" to get rid of the limiter, but I have heard NO good stories about them. Have you looked at a hypertec or super chip programer???