hi Rumcajs...the tuner got by the ECU by bypassing the airflow meter..electronically, it tricks the ECU,so it allows more are flow,he also put in a VNT valve to get the higher boost.The code injectors is what if been trying to find out from Nissan,if its correct and set right...but again it falls on deaf ears,they keep saying its within the limits.Fuel comp. isnt great but its better than what it used to be. The EGR isnt blocked, but i did have to replace it with a new one only 2 weeks ago because it was shot,full of soot and the trap door was shut closed,Nissan couldnt tell me what could of caused it.
it is a problem ive been trying to solve for a long time, but cant seem to get the right answer.
anymore suggestion please pass them on. Cheers