I would not think they will go right on ""BUT""
If you have a decent Muffler shop around , They could probably weld them on. Of course with the extra expense involved your friend would be better off just getting proper mufflers for his Mustang. You should not have a problem selling your V6 Mufflers on this forum.
2012-candy red- V-6 MCA, Automatic Trans. CFM Valve cover breather. MMD blackTail light trim.Magnaflow axle back street mufflers, JLT oil catch can.MMD hood struts.
Airaid Cold Air intake. red caliper covers, 3.7L performance engine cover, Flat black hood spears.Boss 302 strut brace, CDC rear panel, Trunk Cargo net,--Dash carpet cover,
Viser stickers to cover ugly yellow warning crap,Aluminum driveshafft and Swarr Bar.