I know, but a bad converter can cost you MPH on the ET slip (notice I said "slip" in both posts) :D . I was also burned by a GER converter. When I swapped out the GER, the ET dropped a lot and my MPH went up too. So how much HP did I gain by swapping converters??? My MPH went up about 3 mph if my memory serves me correctly, so I had to gain HP (didn't touch the engine, though....)