I have to replace my exhaust. Well actually the oil sump but every bolt on the exhaust is rusted, like completely shredded. So once it's off it is not going back on. Now I know i will be getting a cat back system, either a scorpion or mongoose. Anyone every had these? Also have to replace the cat, is there much point in getting a sports cat when I just use the car for a daily? The price is massively in the difference between a sports and stock. Any advice or ideas would be appreciated. Thanks