i know it spectre so that's the first problem...but my check engine light is on and say it running lean....so i bought the Spectre MAf adapter kit part #9405...it comes with three different size fitting to go around the MAF...so which one do i use,does any one have thsi setup or used the spectre adapter kit...i was told by spectre this will turn the code off but they didn't know what size i would need.....i beleive the sizes are .so what size do i need to be good

Large calibration insert - 68mm or 2.54in
Medium calibration insert - 63mm or 2.48in
Small calibration insert - 58mm or 2.28in