Yeah after you do a couple grand in machining, and get whatever porting you can out of the NAPS-Z head "Not very probable". If you have DPI there isn't much room for programinig the ecu either. Even if you get MPI that came only on the 81-83 200sx there still isn't enough room for reprogramming. I am also a member of the 720forum. Not much power will be made from a NAPS-Z head. Many people in the forum have converted the L20b head onto the naps-z block. The block and internalls are built well, but the head truly lacks in performance. The KA block is nothing more, but a revised Z24block.
Don't get me wrong your setup is great, I like the HKS dual mani, and it appears as if you have a set of 40mm carbs. Great setup, but as I know the majority of the performance you are getting from your ride is through your carburation, the DPI, and MPI lack sever power. I do like your ride though.

 

hey im interested in what turbo that is???

what r the ratios (compressor/turbine)?

 

Not shure what the compressor/turbine specs are. The z18et has (8:3) compression, if the turbo spools an additional 27HP@3psi with no intercooling you can somewhat do the math.