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Fresh 525's by Muscle Marine Inc out of Spring Hill, Kansas.Upgrading to their new 604's only reason for selling.These engine's dyno's at 677 H/P and over 700 ft lbs of TQ!Nasty sounding and very fast!Email if interested and I will help you if i can or contact Muscle Marine direct.No dissapointments and has a 1 year warranty!$35k.Will not split them up!