hey eric this is brian. i just got my heads and intake back from kn performance and they are race ported and i got the motor running and remember the problem i had with the low 02's well now the idle is smooth and the o2's in park are high 600's before they wer 100 to 400 and a rough idle and they wouldt lock on. so something with my old intake or heads caused that problem. you said it was mechanical. the question i got is that with the ported heads would there be a leaner idle circuit and do you need to add fuel for a richer idle because of more air and would that bring the 02's up? i need a new chip for the heads and bigger turbo anyway just wanted to know if it would bring the 02's up. also my crosscounts stop unlike before when warmed and idling in park. my blm's are 123 and fuel pressure at 45. hope all is well