Dynoed my 03 Cobra again and the car lost a little from 4000-6000(10rwhp and 10rwtq), where it went way rich. I used the same dyno and we tried to make everything as close to last time as possible. Could my newly installed TR6 plugs have caused this? It was in the 10's from 3000 - up. It drops off to 10.0(or lower) from 4000-6000. Before it was 12.8@4000 and went down to 10.0@5600. We have the max fuel pulled out with the predator on the performance tune. Any ideas? I know I need a custom tune, which I plan on doing once I put the 2.8 on but why did it get so much richer? Thanks.