Steve Moyer Subaru

I took my car in a few months ago because I lost boost and power. It seemed like something was blocking the exhaust. Turns out both cats were clogged. They replaced them under warranty. I know that just don't happen. So, I asked them why that happened to a car with 75K miles on it? They couldn't give me an answer. They told me my car was fine and gave it 90% rating. A little over a month goes by and I start having similar issues. I take it back to them. They tell me my turbo is now going bad. And to replace it would be over 3K to replace it. I, being around cars all my life didn't think that was the proper diagnosis. I checked things out myself. Turns out I'm losing compression in cylinder 4 (85lbs vs 130lbs in the rest). That is why the cats clogged to start this saga. Their service department is suspect.