Hello,I see you had installs done at Carlisle last year.I am considering headers from ARH and a dyno tune with ECS also.Just wondering how satisfied you are with the work since it has been almost a year now.The one concern i have is that ECS says they do not use a wide band O2 sensor but they use a tail pipe sensor.I have a 2004 Z06 with Vararam and wonder what gains you made in HP and how did it affect your MPG.Thanks for any help as i am truely sitting on the fence right now as Carlisle is getting closer.