There has probably been many a thread on this subject, you installed headers and now you're running a code that says you're too lean. So far no where ive searched on the internet had been able to help me. So I've installed a set of SD headers on my 2000 GT, and now i have the code. Ive searched for vacuum leaks, replaced the maf sensor, hardwired a zzp extension harness on bank 1, put band clamps everywhere i could fit them, and even put an o2 emulator on the downstream sensor in case it trys to run a code for no cat. Can someone please help me?