Thothage

Hey all you guys with baskets. I have an '07 Spec B, and I've been debating on installing a basket. But I'm on the fence. How's the gas mileage and the noise? My buddy just put a Yack rack on his '09 Impreza with some sort of bike rack and he says it's super loud. He doesn't have a fearing, does the fearing make a huge difference with the noise?