Nistune wont control your boost and my experience with the nistune in my car wasnt that crash hot could never get it to idle consistent cold start took few turns more than usual not saying they are bad dont get me wrong just always seemed to have lotsa annoying little bugs that just couldnt be sorted other than the above mentioned my car ran good and made good power just seemed that using a chipped ecu that is designed to run a 3L twin turbo V6 on a 2.5L single turbo inline 6 just aint really meant to be.
My 2c and the opinion of my tuner also