2007 G35x 119,000 miles
I have 2 noises my car is making and I don't know where to start but I have some idea's. First, under hard acceleration from a stop or going very slow, The front end will pop. It sounds like its coming from inside the driver side wheel well.

Next, when braking harder than average, some squeeks can be heard from the rear driver side. Usually 2-3 little chirps. It sounds like it is under the rear seat.

Bonus question:
I replaced all 4 rotors and pads, the rear passenger has a squeek that I cant solve. It happens under typical braking but will not happen if I brake hard.

 

Could the harder than average breaking just be the tire letting loose a little?

 

No, its almost like bushings on the sub frame sliding. I'd be tempted to have every bushing replaced.

 

Fixed the squeak from the break pad. Removed pads, cleaned rotors and pads, all quite. I also removed a loose heat shield from the passenger side catalytic converter which was rattling at low idle. Just 2 noises to go.