so this is the first winter with my 9er and am doing alot of maintenance. i picked it up w/ 14.700 miles last may. since i have put 11,xxx miles on it and did the first valve check ever with no adjustments needed. i am going to replace the spak plugs and was wondering if anyone here had ran the iridium ngk plugs. the local shop has the stock plugs in stock at $9.xx a plug and i can get the iridium online for $7.xx a plug. any thoughts would be great!