How's it going guys?

I have a 2011 G37xS Coupe and recently replaced the brakes/rotors. I bought:

-Front/Rear Akebono ProAct Pads (New, Link)
-Four (4) Factory Sport Rotors from a guy here w/ only 1k miles (see FS post here)

Having the exact same brakes previously, I'm used to the occasional squeaking in the morning when it's cold and I first start the car, but it's become apparent over the past three weeks that I've had the new parts installed that something is clearly wrong. The brakes squeak very loudly (at least 3x as loud as normal) and it doesn't really go away after driving for awhile; if anything, it just gets a tiny bit quieter, but still obnoxiously loud.

*Note: I had a family friend/mechanic install these, and he had 0 issues with installation, everything fit perfectly.

Can anyone offer up any advice before I take it into the shop? I would ideally like to take it to Infiniti, but I'm a little nervous because I have a Tanabe Axle-Back Exhaust and a Viper remote starter and I'm afraid they are going to void my warranty for these things and tell me to pound sand.

I can still brake okay, but the squeaking is insane. Any advice is greatly appreciated!

 

Apply CRC caliper grease (or equivalent) to all metal on metal parts that will be moving. This includes the sides of the pad backers, the backing plates, pins, and if you're using shims a thin coat between the shim and backer and a bit heavier on the shim surface that rests on the pistons.
If you've already had the grease properly applied then something else is causing that high frequency vibration.

 

I have Akebono ProACT brake pads and Centric premium rotors without any squealing at all. An occasional chirp after sitting plus contact with water, but nothing like you are depicting. Unfortunately, I had a performance shop install these so I can't give any pointers, only hope that the brake pads are good.

Good luck!