lots of noise and creaking from the back end of my msp..

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MazdaSpeed Protege 2003.5
I recently purchased and installed some megan racing coilovers on my msp and after a couple weeks the abs and brake lights do not turn off and even after replacing the bushings the rear sway bar there is still a lot of noise and creaking in that area.. I do not know what it could be.. any help?
 
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