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Never drove it before duals were installed.I think i am going to get some of that heat wrap and cover filter and try it.Is not showing any fault codes other than o2 sensor which was removed when i installed headers and pipes.
bd i thought when the o2 fails or is in-op then the ecm goes into open mode which gives the engine more fuel than normal. and this is why its running good when cold but once warmed up it still has too much fuel causing it to run rich. but running rich problem can seam like its running lean problem right? but yeah first things first either mount your o2 sensor or buy a dummy o2 sensor. the o2 sensors not the only thing that will cause this problem but since you know its not there its a good place to start