everything i have read suggests that the pcm does not use the O2 sensors at WOT... But when i ran my dyno run with a bad downstream HOS and a CEL it ran really poor. Now that i have a good O2 sensor I think i will give it another pull (as soon as i clear up the cam noise, sticky throttle, and bad tranny/motor mounts). If i don't see gains of about 10-15 hp, and 15-20lb/ft of tq, i am gonna be really pissed at SHM.
