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You can upgrade the management system without downgrading the mechanicals of the engine. That being said unless you are putting more air into it (via camshaft events, or forced induction) or controlling ignition timing (getting rid of the distributor in favor of COP) you will gain practically...

Be more specific as to what you are looking to upgrade.

what are your goals? Better then a Sniper would be to do a MS product or Terminator X on the existing OEM designed port injection.