I have a stock 6.1 hemi charger with CAI and straight piped. it was dyno tuned and gained around 30hp at the wheels. My best time was 13.05 on street tires. I recently installed a 4000 stall protorque converter and 3.92 getrag with stage 5 axles. Also a brand new set of MT 305 ET Streets. I have read guys pick up 4-7 tenths with the new gears alone. I also read with the torqe converter guys pickup 3-5 tenths.... with this combo is it possible for more to run close to 12.20 or even 12.00? thanks in advance!