"Converter change" how much improvement...

I went from a Mopar perf. converter that stalled about 2200 to a PTC 11" that stalls 3000 and it made a huge difference. In fact it roasted the tires so bad after I put in the PTC I had to get drag radials. With the MP converter it ran 14.30's. With the PTC it runs 13.50's. The drop in e.t's was mostly from the converter because it never spun hardly at all with the MP converter and stock radials so it wasn't the drag radials that dropped the times that much.