top hat nut

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Ive had my 04 350z MT for almost a year now. Got it with 85,000 miles very well kept. Im the 2nd owner.
Have been replacing parts here and there as this car will be for my son in a couple of years. Slowly been replacing suspension parts along with other parts.
I installed some Tein Basis coilovers a few months ago along with some white line bushings in the front, compression rod, front and rear end links, front strut top hats etc… I have been getting some knock/popping noises in the front suspension on both sides. Mostly under very slow speeds or coming out of the driveway.
Just by using an impact gun will the top hat nut get tighten enough? At first when i installed the Tein coil overs i used the impact gun to get the top hat and nut on out of the car. Then after a few miles i used the impact gun again to tighten the nut but this time the struts were on the car. Is there a possibility that this nut on both sides is still lose and causing the popping noise in the front? I will be installing some new ball joints in the next week. Ive tried to replicate the noise while under the car but can seem to find where its coming from. Ive also re-torqued the suspension nuts/bolts in the front. Car rides great and there is no abnormal tire wear. My next step is doing the ball joints and removing the coilovers and re tighten the top hat nut. Any suggestions?
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