Hey guys quick question. I'm getting an engine vibration noise when I hit 30 mph in 3rd gear. I'm wondering what it could be. Like the whole engine shakes, it's a loud rattle. But it's only in 3rd gear at 30mph, no where else. I'm wondering could it be the heat shield? I think its usually between 2600-3000 rpm when it happens. I notice if i stay in 2nd, and RPM it to over 30 mph, and then shift to 3rd it doesn't do it. Could it just be turbo lag?