Installed on 04 F150 5.4, wasn't as loud as I would like. The sound is excellent low growl, the rumble is not noticeable at any speed. When first installed, barley could be heard on the normal one, since it broke after about a month, the noise got a little louder. I didn't notice any performance gain, I bought it for a little growl. If you want sound I would recommend the 40 series or the Super 10 muffler. If you're replacing OEM rust and want just that little bit more, this is for you.
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