MAC makes pipes for 6er's to convert to dual exhaust. Their web site is "http://www.macprod.com" Good thing about MAC is, they are bolt-ons so you can remove it anytime you want. Becareful to pick mufflers that are quiet or ones that make it low (which are hard to find for 6ers). My friend put dual exhaust with 2 flowmasters on it, and his sounded like a ricer. It looked like a mustang but it sounded like a civic. I don't think you want that....
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Cyberstang5.0
1992 Mustang GT 5.0
Houston, TX