You can get the Ford Racing 5.0L cams most anywhere these days, and smart shoppers can find them for about $169. The roller rockers are a bit more at $269, but they are optional. Some may say that's a good bit of money to spend just for the sound and a few horsepower, but you'll pay far more for that particular exhaust system that floats your boat. At that point, the camshaft is a bargain. Thumpity thump, thump. Thumpity thump, thump, look at your Mustang go.