105000 inspection. What may it cost and which workshop to recommend?

Hello. I own an Impreza 2.0 with a gas system. Now I’m due for the 105Tkm inspection and I read everything about “900-1500 € solltest du einplanen”. Now I just went to the first Subaru workshop, which Google spat out in my vicinity, and asked the price. A few minutes later the call: 2400-2700 € and about 1.5 weeks I would have to do without the good piece. And that would be only the “planned” inspection. That means without,( wa of course, the price difference seemed pretty bad to me. So directly to another workshop (also Subaru again) and also there the information: “about the 2500 € around”. All free workshops reject the work in principle. Then there is always only the statement “we do not have the tool to expand the engine. Could then still do it, but takes 3-4 weeks and costs with certainty ni cht less than 2000€” I wonder, of course, where others get the work done for almost half of the amount? Can someone recommend me a reliable workshop in the area of Essen (NRW)?