I don't have a wideband hooked up so I'm wondering how accurate the EFI scanner is in measureing AFR? I'm hitting 6 KR with my new pulley and the scanner is showing AFR of over 14. My truck is a 2003 AWD Silverado SS with a radix with a 3.0 pulley. I've got all the normal bolt ons(headers, exhaust, cai, plugs, plug wires and 160 degree stat.