bang noise!! help

hi all, just had 4 wheel alignment done and done 200 miles today and drive first class now but when i go over a cats eye i get a bang from the front on both sides it has allways done this but is it normal on a tf or should i be looking for something, it doesnt alter the steering or anything just an anoying bang so i try to avoid cats eyes when over taking!! lol, thanks all for advice

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