The big gorilla, of course, is the S351. Introduced with the SN95 body style in 1994, this is the car many Mustang freaks think Ford should have produced all along. Of course it isn't cheap. S351s start life as V6 cars, with one exception. In addition to the usual suspension, cosmetic, and interior mod's, the entire drive train is trashed. In its placed goes a 5.8 Liter, 351-cubic inch Windsor with all the performance bells and goodies you could wish for. Rated from to 484 to 507HP, depending on the year, the S351 is a tire-shredding, Viper-eating monster. Not a car you'd want to pick a fight with lightly!