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NGK iridium plugs run 1 tank of gas so far. Noticeably smoother off throttle and thru the rev range. DP air lid, K&N filter, Fatduc, G2 tube, stock pipes. DCPR9EIX $10.00, gapped @ 30 thousandths. One heat range colder than stock, no 10's in the catalog. NGK goes colder on higher #'s, opposite of all others ex. Champion, Autolite. Article in May '09 Thunderpress "Motorhead Memo" on iridium plugs.