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Two of the biggest names out there, Cobb and Works, offer engine management solutions for your Evo X. Cobb's AccessPort is known world-wide as one of the best tuning platforms for many vehicles. Works is a well-respected name in the tuning world as well. NO matter which way you decide to go, you'll squeeze more power out of your stock parts that Mitsu was comfortable doing or you'll be able to maximize the gains of your engine build by customizing every aspect of the ECU's operation.