If you don't have a method to check the AFR's for yourself I'd try to get the car to them for the tune. My email tunes made me nervous. Jerry said they were safe, but I wasn't convinced, so he fattened them up until I was content. My car gets real hot racing and I wanted a richer tune for that reason. Not to mention that once a year I stack my 65 mm Code 3 with my 178 for kicks and giggles. Then it does get a bit lean up top. As well as tear the skin off your face.

Les