i also had the banging and clunking in the front after i installed my swift springs. (i know its not kw coils) but... it turned out to be my sway bar wasn't torqued down all the way. causes a slight clunk when going over bumps.
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09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways
326whp/268tq
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