I have seen .30 ET change with new tires and the right pressures BTW, don't be suprised if the neck hurts a little after a good hit Neck snapping torque and traction, just like all the other good Mopars BTW, why does the other converter need fixing? Is it broke or are you not sure? If any doubts send it out On the first seriuos race car I work on we had a bad expereience with a well known transmission company who had just started making "race" converters, his converter was slower ET and MPH than the stock street Hemi converter we had we ended up going .7 faster and about 1 MPH slower with a different brand really good 8 inch converter versus the stock 2400 RPM street Hemi converter Buy a really good converter to start with I'm glad the car is going faster and your out there testing, tuning and hopefully having some fun