Dyno graph from 1st attempt at tuning. Dotted lines are from 1st dyno run. Solid lines are from last dyno run. There were about 8 or 9 runs in between. The curves show much more power and torque below 4000rpm. Above 4000rpm, improvements are marginal. At the bottom of the printout, the scanner didn't pick up the max power & torque for the runs. It looks like I gained 6hp. You can get 6hp doing a tune on a Spec Miata.