getting fast rives on N and laggy back to idle

hi guys

i got a 300c srt8 from 2006 and it heavy modded NA modes
i got it tuned well but i want it to rive good and fast on N so what to able or disable to have this done ?

also the rpm is really taking time to get back to idle after i rive it !
where to fix this ?

thanks all

up up plz

I think you're saying you want it to rev fast on neutral, is that right?

yes and in the end of the gear if i didnt shift like i run in second gear then let riv before changing the gear ,, the feel of a manual gear .. i saw some ppl got it in there car but never know how to tune it >
its not a performance tune so am not asking for free tune or any think lool its show of tip .

thanks