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spark plugs


ok guys, whats the best plug for this engine? I hav'nt tuned it up since ive owned it (4 yrs). No real mods cold air, slp catback,  03 GT Conv, drives about 20 miles a day . looking for lowering kit, headers,  light bar shes got around 80k on her too,and still runs like a champ.

Stick with the stock plugs. 


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