Once I ve dismantled the valve I saw what a mess is this system, you guys cant immagine how dirty it was. So I was even more convinced to close it.
I ve cutted and shaped a blank sheet alluminum plate of 1 mm thickness.I was immediately happy when I tried the car , in my opinion I ve gained some more torque at the low Rpm, and in general the car is much more linear.

EDIT:
One of our members "took one for the team" - thanks Chick Magnet

Extra thanks to Tex for showing us how it could be done even better:
Consider also this much shorter thread which may be a better quick reference guide:
http://www.newtriton.net/phpbb/viewtopic.php?f=39&t=7472
Page
1 photograph where to block the ML 3.2 DID EGR (blank on top)
2 discussions: EGR blank: reduced smoke?
3 What is Exhaust gas reticulation (EGR)
4 Photographs where to block the ML 3.2 DID EGR (blank on bottom)
4 Positive crank case venting photographs
5 What a Stainless steel blank plate looks like
6 Diagram of how to install it in relation to joint
7 Discussion of Check Engine light (CEL) Caused by the EGR blank
8 more photographs of EGR blank plate + getting installed
8-20 lots of varying reports from people that blocked the EGR
20 MN triton: where to block the EGR
21 legalities regarding blocking the EGR and emissions
23 ball bearing modification getting discussed
25 EGR diagrams of MN triton 2.5hp
25 ball bearing modification discussions continued with photographs
26 wiring diagram for 2.5hp MN EGR throttle body valve
26 explaining why blanking the EGR cause CEL's
27 brief engine gas temperature (EGT) discussion relating to fore and against
30 "Chip It" explain why the chip it map controller changes the pressure read to not cause a CEL
31 discussions: finding a solution for the CEL with the 2.5hp
32 Tony and Longranger discuss the "longranger modification" and its advantages + plus what it does
34 discussions: Where to blank my MN 2.5 EGR
35 Solution for the EGR and CEL issues 3.2ML "Coxy's inline relay mod" (needs refinement)
37 Tonys version to stop CEL's with the MN 2.5hp
41 EGR and CEL's solution that won't affect economy
43 Photographs of the "Longranger stage 2 bypass"
47 EGR and CEL solution: MAP sensor with one way valve (photographs)
49 EGR and CEL solution: Map sensor with one way valve: improved (photographs)