I've always liked Allied MeanStreaks and Magnaflow for sound and performance. The Allied mufflers are a bit beefier for offroad and seem to hold up better. I've had them on 4 vehicles so far and really like them.
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Charlie

Sensitivity is important in any relationship...
"I don't like country music, but I don't mean to denigrate those who do. And for the people who like country music, denigrate means 'put down.'" --Bob Newhart