2 1/4 exhaust slant 6

I had my 65 Valiant Signet outfitted with 2.25 last year all the way through muffler to rear. Today I find that the first 4' off the manifold is less, maybe 1.75 or 2". The tech said he couldn't do 2.25 from the header. Can it be done and should I find another exhaust pro?