Jcards26

I just recently installed a greddy 18g turbo into my integra with an obd1 p28 tuned with a basemap from J-K tuning. Before this i had a vafc tuned to my car. After finishing my setup i decided to keep the vafc. Randomly, after the car has been running for a while it will randomly start to lose power. the cd player turns off and the lights will dim, then the car just dies while i am driving. This has happened numerous times so i figured it was either the battery or the alternator. I replaced BOTH of these things and it still happens. Does anyone know what could be the problem? I checked the connections on the battery and replaced the terminals.

Any help is appreciated... THanks