OK everyone when i had the turbo the CEL came on due to no cat, I thought i burnt up my O2's cause i ditched the turbo and put the stock header and cat back on and still had a cel replaced the o2's and still had a CEL now I have a header eliminated the cat and put a simulator on but stilll yes a CEL....could I have damaged my MAF sensor and this is causing my bogging down? Or is it the O2's I tested the output signal of the O2 sensors and they are right on the first signal fulctuates between . 3 and .8 the second signal fulctuates between .2 and .5 so it is getting the lower signal as it should but still no go this simulator worked with bih bena nd many many other cars and i know i have it hooked up right.....when i put it on the scanner everytime it has given me a emmisions code i konw that the MAF being damaged can cause this code to be thrown as well so do you think thats it? any suggestions?