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Our H3 Raptorq ECM Upgrade offers your 3.5L and 3.7L Hummer an additional 40HP, on average. Finally your H3 can safely manuver through the tightest terrain, wether its trails or traffic, with ease! Each ECM is specifically programmed for your vehicle. This is an exchange item and a core charge applies. Core charge fee of $500 will be applied at time of order fulfillment and will be refunded once it is returned.