I have a 2004 Ford Mustang V6 3.8LI, can't say it helped with the sound. I converted the stock exhaust to independent piping with a Flowmaster before purchasing these headers and the sound was great. I see no difference after installing these distributors. I was expecting a better sound but was only disappointed, seems like I lost my money. I can't tell if they give me a little more power or better fuel economy. If you plan on installing these headers by yourself, you'll have to work hard. You will need to jack up the engine on both sides and possibly change the piping. If I had stock mufflers I would probably give a better rating.
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