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the bullet style mufflers like slp and magnapacks tend to be louder than regular style mufflers...borla flowmaster mac and magnaflows tend to have a more mellow tone, here...https://mustangforums.com/m_2189116/tm.htm
Theres alot of good names and good mufflers, shop around and pick one that sounds right for you but wont break your wallet. Theres a "best combo" for everybody. Yours is going to be different then anybody else's. I like Flowmaster personally.