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I have mostly stock 98 a4 that I run hard every so often...Should I stay with the stock heat range plug or go colder,, I am getting the nippondenso irridium plugs ,,,IT16 stock, IT20 colder,,,anyone have suggestion for best plug?????buyning tonight,, please help today,,,AND is a autotap a good investment????for odbII troubleshooting,,what to buy,,,,,would like to firm up shift points, is it worth the effort:partyon: :partyon: :partyon:
 
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