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The 2003 and 04 Mustang V6 4R70W's should have the J'mod done to them already. I was told that and got a 89k 03 model for my Lincoln project.
 

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Mine had a 3.9. It had 401,000 miles on it when I sold it. ... I hated the sound of the engine as I hate the sound of any V6. The best exhaust for any V6 is a quiet one. Rotary muffler sure helps too.
V6 sound, yeah, add more cats, resonators, cross over, full tail pipes, and the quietest muffler you can. Then they aren't too bad.
 
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