def motor mount....mines makin the same noise...especially wen you shift the car (I do it for breaking and accelerating around turns staying in one gear).....If i have it in 1st and acc. to a slow speed and let off around a turn it will clunk....just havnt had time to replace it yet
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(99 GT),K&N 9" intake,ZZP HV TB(68mm), ZZP PCM,ZZP front powerlog, HV3 intake manifold spacer, 3" DP to SLP exhaust,Comp Cam 801 and springs, MSD ignition,Voltage Booster,black housing headlights with HID kit and halos