I dont know how much it will cost to have them welded, i figure it cant cost that much if welding is all they have to do. But my friend has a welder and he helped me with the hangers but im going to take it to a muffler shop do have them weld the rest, because i may have to have some pipe bent as well to give it a real clean look. If it were me i would just get 2 1/2" pipe all the way back, its not that much more money like i said $135 for the tail pipes off ebay. but if you dont have the money do what ever you need to do, either way it will sound better then what you have