I'll have to check this out as well. I get a similar thing. Mine makes an unpleasant noise around 1800-2000rpm, no matter which gear I'm in. It is also a manual.
2003 Lamborghini Murcielago
2007 V6 Mustang (manual), Hurst/FR short throw, MAC dual exhaust, custom H-pipe, chin spoiler, GT front bumper, billet aluminum grill, GT500 rear bumper, GT500 wing, FR windshield banner, FR strut tower brace, LED interior lights, sequential taillights, FR side markers, slotted and drilled brakes, 93 Cobra teal painted (and cleared) stripes, etc.