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I hate my flowmasters, it sounds like my stock V8. Cross, it depends on how much you have, and willing to spend on pipes, and what you looking for. Flowmaster is OK for sound, not a great idle. Borla on any mustang sounds nice. Also try asking in the 4.0 section, they will know what sounds best on your car (05+)
i didnt relize it was for a s197.....so now im goin to say magnaflow for that year...i know someone who has that and sounds better and louder then the gts of that year
he cisurfer lookin good in the sig, i love my flows but dont know what they sound like on a 4.0 they sound great on the 05+ gt but i dunno bout ur sixer