1. you are guessing about the intercoolers. 2. it may have worked fine when he sent it to you and died somewhere in the 3 years you had it. If you wait 3 years to find out you relinquish any claim whatsoever. Even if you bought a brand new pump from nissan they would laugh you out of the service department for trying to return a pump you bought three years ago.
Antihero
Putting AMS garbage, and $500 ebay wheels on a Z is like dressing a Victorias Secret model in a Walmart dress and Payless shoes. You're embarrassing yourself.