Hi all, new to the forum and have just bought my first 350z GT. Ive done a search and tried everything which could pinpoint to my problem. Ok i have HKS RS coilovers on my 350 and everytime i go over potholes or small bumps i hear a bad knocking noise coming from the rear passenger side. Ive removed the shock and tightened the top nut, mad sure all the nuts and bolts were tight, changed rear droplinks and still have the knocking noise. Its been over the garage by my work and we cant figure out where the noise is coming from??? Now i noticed the rear passenger side was sitting slightly lower than the drivers rear so i adjusted the spring to try and equal it out but there is a huge difference between the 2 sides where the 2 locking nuts are situated. About 15-20mm on the thread. Ive tried adjustining the damping force also and is set really soft but im still having the same problems with the knocking. The only thing i could think of was a dodgy shock? Im abit stumped. If anyone could help i would really appreciate it. Other than that i really love my new toy