My current Vigilante can't keep up with the power the motor is making. The Vigilante stalls 0# boost at 2600, and launched last Saturday at 19# @ 4250 RPM on the footbrake. Shifts are still good and solid, with a 750 +/- RPM drop. But, I'm loosing MPH @ the shift points compare to where it was with the 6152 turbo. I feel it's time for a new converter. What do you recommend for the combo in my sig?