Theories I have that need explanations about my new used exhaust- Have a random classic for your troubles if you read this

So Oppo, just yesterday I had my exhaust replaced from the downpipe back on my 04 WRX. I found a CL ad for an 06 STI turbo back exhaust for 250. My situation was I had a crack in my catalytic converter (after the midpipe) and on top of that a lot of New England rust keeping everything "nice" and "snug". So anyways,…

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