Ok I have been reading on here and posting very little for the last couple of months and now I have more questions. Someday I promise I will start helping some of you out on answering questions.

Things that I have changed in the last months time.
Southbend clutch
Tymar full 4inch exhaust no cat or muffler
Fuel pump and turbo orings and other leaks on top of motor.

Now to my question I had a check engine come on after having everything diconnected and couldn't figure it out I order and hooked up to the scanner and got the back pressure error code and one for low icp voltage so I cleaned the plug for icp and the check engine light went out. But now when I scan the computer I get a code P1111 System Pass It doesn't give a description first code it has ever did this with. What does this mean.
Also when I scan the computer my motor stumbles and the wait to start light comes on if the motor is running. The software is auto engiunity which does our specific codes but I am still learning how to use it.

I don't know what you all are talking about on exhaust and better mileage I got the worst I can now that I have mine have to stand on it just to hear it sing.

Sorry for the book