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I kinda had some minor popping when I had my 14 FRS after upgraded to coil over and I thought it was normal but I never had another set of wheels on it just stock. But now I have a 16 brz and that popping nice came thru after I tried some other wheels 18x9.5 and they were kinda heavy compared to stock. I sold the aftermarket wheel set once I was in stock wheels when ever I would turn my steering wheel the popping sound became more noticeable. I did some research and I guess the rack and pinion came a little loose torqued it down to 55 foot-pound and the sound was gone. And I actually tracked down the sound after I dismounted the front wheels, turned the car on not fully on but for the electric rack pinion to move with ease, the popping noise was on just the driver side
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