egr off

Good afternoon, I recently deleted the EGR and DPF, both physically and electronically/remap (ECU), but I asked the mechanic/tuner not to change the injection values, turbo pressure, etc., so as not to compromise the reliability of the engine/clutch/etc. After the EGR and DPF were removed, the...

Hello. After remap+egr delete, 1 hour later I noticed a strange ticking sound. It only appears when you release throttle from 1000-1100 rpm(only when rpm drops from 1100 to 800). I think sound comes from egr himself. What is the problem? Is it normal? Video link: