Hi all, I just finished an H&R race spring and Bilstein strut installation which seemed to go pretty smooth. However, when I take off in 1st gear, I hear a knocking/banging sound from the rear of the car. I have verified that all of the bolts are tightened and torqued down; stocks, lower control arms, and sway bar. This sound only happens when I take off from 1st, however if I really ease the car from 1st, it won't make the sound. As a note, I also used my stock spring isolators, however I'm not certain if this would cause a sound such as this. Any ideas? Thanks in advance.