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Old March 1st, 2007, 10:47 AM   #10
mooseracing
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I was running just the 2 cats on my 4.6 but there was too much interior resonance. So i went and did high flow cats (as mine took a shit) then added single American thunder 40 series in the 2 3/4" size single exhaust setup and sounds alot better with alot less interior drone at highway speeds
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