agree with Yatta and istan, diesel chips do more harm than good.

cleaning the air intake line, intake manifold and EGR are the quick and easy fix.

installing a throttle controller (although no extra added power) will also help in bringing back the quickness in accelerating, helpful in uphills and overtaking.

for the ultimate remedy if you want more power and torque, go for a ECU reflash or remapping.

Sent from my SM-G960F using Tapatalk