A 3" Hushpower II is $179 at Summit.
It also looks to have a rather large body, I don't know if it would fit in the exhaust tunnel. At that price, however, I could easily get a set of Magnaflows or something else. Hmm...
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne