Originally Posted by BrianBrave

Not sure about Chi-Town tune results, but Chi did a Dyno run before he sent his ECU to InMotion and his A/F ratio from the factory was around 12.5 which is very good.

My A/F ratio from the factory was 10.5 - way to rich, even with the pulley installed - this was robbing me of HP so for me the ECU tune was a good thing.

Plus it raises your RPM limiter, SC engauge, and Speed limiter so you can hit 190 mph on the Texas mile........