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Flows with an x sound awesome. It tends to "clap" a bit as does anything with an o/r x pipe but it eliminates some of the monotone drone that everyone hates about flowmasters. I can carry a perfectly normal convo while driving on the highway at 70 without yelling with 4.10's. The sound has more character to it with an x pipe than an h pipe.
you cant really go wrong with flowmasters. I mean really...does anyone really hate the sound of flowmasters like some hate the sound of LM1's or Magnapacks??? Flowmasters have been the iconic mustang sound for years. You cant really go wrong with it. Just gotta get a set paired to what you like. Like single chambers for insane loudness, super/original 40's for the normal enthusiast, and then 50 series 3 chamber flowmasters for those who want to keep the noise down a bit. Cant go wrong with 'em in my opinion.