I bought a Ford F150 5.4L that came with a single cam Flowmaster. I don't understand why anyone would need such a loud silencer. I didn't want to be "the guy" who drives around, so I went with this Magnaflow. Sounds great, just a nice little hum at idle or low revs, but still sounds good on the track. It cost me $30 to install at a local muffler shop.