MY dyno and ET slip, What do they tell you?

Lose that converter asap, I looked into those Boss Hog verter's and they are NOT an ideal setup and are made cheaply, not trying to be rude just would hate to read about your converter taking a dump on you and taking out more parts. I'd say you need to get the tune up as close as you can before you read too far into the timeslip. For a chassis dyno check out the new Mr. Norm's garage in Machesny Park, ILL they have a chassis dyno that they tune there mid 7 new hemi challenger on, I think they've actually got 2 in ground chassis dyno's now and they have a very good tuner down there.