by rattling and clunking you mean metal to metal sound??
ARKS x pipe section needs to be lifted/jacked up during install over the cross member before tightening any bolt, otherwise it will sometimes rest on it and cause rattling/clunking. a proper reinstall might fix it.
as far as hissing or howling sounds, its the test pipes adding extra exhaust flow that the ark x pipe cant handle.
and btw, post some pics!
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2011 Gun Metallic 370Z Base w/ Sports Package 6MT
Mods: HKS Hi-Power, Test Pipes, Black Z1 Stillen G3s, Swift Springs, 20mm spacers F&R, AuCar 13.6' Android Screen, Backup Camera, G35 Homelink, Rear fog
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