Twolane,can you tell me why you chose the Rev Perf EMS over any of the other systems.TTS,Power Commander,SERT,etc... My problem, having a build done.The shop cannot access the computer to make any adjustments. I told them I had the TTS as well and they want me to use that to dyno the engine. I explained to them that I can send the ecm to Rev Perf and they would remap with the new info and send back to me. Reinstall and let the EMS do its magic.They wont warrantee the build because they think that the EMS will lean out the motor too much for breakin. They want to be able to adjust for break in. They also said if I had the SE tuner then that would be ok also,because it can be adjusted. Any thoughts.