Moroso spiral flow
they were on my car maybe 2000 miles (max) i put them on my car maybe 3 years ago had engine troubles built a new engine and tranny set up drove it a few hundred miles last year i changed cars and set up went with a 4" mufflex with a flowmaster muffler here's a video from it last year it's not an obnoxiously loud set up it can get louder after 3500 rpm's ! http://www.youtube.com/watch?v=_0G0Y6AnacI
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