I agree, Flowmasters definately has the Mustang sound. I had what used to be called 3 chamber, which I think would be the 50 series. I now put on the 40 series with Delta flow. It is a little louder, but not much more than my old 3 chamber. I also have a convertable, and I thought the noise would be too much, but it hasn't been bad at all.
Good luck,
Brad
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1991 Mustang GT Conv.
K&N air filter, Cobra manifold, 65mm TB,
Adjustable fuel pressure regulator, 180 thermo., Mac headers,
High flow H-pipe, Force II W/2 chamber Flowmaster,
Hurst Shifter, 3.55 gears, subframes
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