This is common with aftermarket springs. Either the rubber pieces where the springs sit on the shocks weren't installed, or the rubber silencers that wrap around the front springs were left on the OEM coils and never installed. The silencers go where the tightly wound part of your Swift springs meet the loosely wound portion (if that makes sense). Either way, aftermarket lowering springs are stiffer and will produce some noise regardless. You can put your car on a lift to unload the springs then install the silencers. If they're gone, just use any durable material (I suggest rubber) to keep the tightly wound coils from contacting.
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2013 MB NISSAN 370Z SPORT
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