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11 For the rest of our exhaust, we called upon the guys at Pypes Exhaust for their 409 stainless steel 2½-inch dual exhaust kits for ’65-’73 Mustangs. The SFM03S kit includes an X-style mid-pipe kit, extensions, tailpipes, and Pypes’ Street-Pro mufflers. For our ’70 coupe, we chose the quieter, yet great flowing, Street-Pro mufflers, but Pypes has several muffler choices you can choose from and listen to on its site. The SFM03S set us back $495.50.