At 10000Hz on the L67 MAF table, you are flowing 240.61 Grams/Sec of air, but at 10000 Hz on the L36 table it is calibrated to 215.41 grams/second. You will run very lean (about 11%, so if you are commanding 11.5:1, you will be getting 12.8:1) and your wideband air fuel meter should be telling you this. so the L67 flows .24 grams a Sec per Hz and the GT flows .21 grams a sec per hz