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IMO, I run Corsa + test pipes, and I find it notably louder in the cabin when I get on it compared to OEM. It's also notably louder inside then the 2.5 pipe OEM mod I ran on my previous car. When I drop the windows down, it's actually a similar volume to what I hear with the windows up. But if you're not getting on it, it's a very subtle exhaust. "Gentleman's" exhaust describes it perfectly; an incredible tone and note, with subtlety at will.
In terms of drone, the Corsa does have a tiny bit of it. Mainly because it's higher pitch than the stock exhaust. So at freeway speeds, I think the volume is about the same as OEM, but the pitch makes it more obvious, if that makes sense. My 2.5 pipe mod had horrendous drone at first, contrary to what people said on here. Luckily, it broke in after about 1000 miles. Then it was a bit louder than stock when cruising. The Corsa setup was much better during the entire break in period. It was pretty loud at first, but it settled in after about 200 miles.
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