Auction sale cm870 Runs like crap

[Another Dumb Farmer]

I bought a ihc 9900 in a local auction with a 475hp cm870. picked it up at the owners yard and he told me it was a great truck ready to work but it ran rough when cold but smoothed out after it warmed up and that he had swapped the head to try fix it. Anyway got it home and hooked up to a set of super bs and it is completely gutless and will only pull 10psi boost. Looked under the hood and the egr valve is unplugged flex pipe is gone and the egr cooler looks to be filled with spray foam and I have 2 egr codes.im thinking I should get it de mandated as it is legal in my neck of the woods. I read on here that I should not take it to just any shop to get it de mandate does anyone know who I should talk to for a reliable de mandate.