Remus sport really isn't that much louder than stock except under load at higher RPMs. It's a good-sounding mild no drone exhaust. It's also eliminates the "hang" of the stock mufflers and the tips and cans look much better. But don't expect loud--that is not characteristic of this exhaust. I had, and sold, mine a few years back.
Is it possible the connectors were tightened too much on one side leaving a leak? It's possible to do that. The connector ends should not touch and should have a pretty even gap. And "super tight" isn't required. There should not be a quiet or vacuum sound. That sounds like a leak.
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