I have a Magnaflow 2.5" Catback with Magnaflow tips for $120. This is just the pipes and tips nothing else, if you already welded mufflers to your car (what ever brand) then this prefect for you since you can complete the catback for cheap. it should fit all 1999-2004 mustang gts, might also fit earlier ones but not sure
pics:
GT Magnaflow Catback (No Mufflers) $120 - 3.8 Mustang Message Board
pics:
GT Magnaflow Catback (No Mufflers) $120 - 3.8 Mustang Message Board